udf: Remove declarations of arrays of size UDF_NAME_LEN (256 bytes)
There are several places in UDF where we declared temporary arrays of UDF_NAME_LEN bytes on stack. This is not nice to stack usage so this patch changes those places to use kmalloc() instead. Also clean up bail-out paths in those functions when we are changing them. Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara
parent
9bf2c6b834
commit
b80697c14d
57
fs/udf/dir.c
57
fs/udf/dir.c
@ -39,13 +39,13 @@
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static int do_udf_readdir(struct inode *dir, struct file *filp,
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filldir_t filldir, void *dirent)
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{
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struct udf_fileident_bh fibh;
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struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
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struct fileIdentDesc *fi = NULL;
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struct fileIdentDesc cfi;
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int block, iblock;
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loff_t nf_pos = (filp->f_pos - 1) << 2;
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int flen;
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char fname[UDF_NAME_LEN];
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char *fname = NULL;
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char *nameptr;
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uint16_t liu;
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uint8_t lfi;
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@ -54,23 +54,32 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
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kernel_lb_addr eloc;
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uint32_t elen;
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sector_t offset;
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int i, num;
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int i, num, ret = 0;
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unsigned int dt_type;
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struct extent_position epos = { NULL, 0, {0, 0} };
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struct udf_inode_info *iinfo;
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if (nf_pos >= size)
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return 0;
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goto out;
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fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
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if (!fname) {
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ret = -ENOMEM;
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goto out;
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}
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if (nf_pos == 0)
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nf_pos = udf_ext0_offset(dir);
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fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
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iinfo = UDF_I(dir);
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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fibh.sbh = fibh.ebh = NULL;
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} else if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
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&epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
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if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
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if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
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&epos, &eloc, &elen, &offset)
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!= (EXT_RECORDED_ALLOCATED >> 30)) {
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ret = -ENOENT;
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goto out;
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}
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block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
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if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
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@ -83,8 +92,8 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
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}
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if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
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brelse(epos.bh);
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return -EIO;
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ret = -EIO;
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goto out;
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}
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if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
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@ -105,9 +114,6 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
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brelse(bha[i]);
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}
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}
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} else {
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brelse(epos.bh);
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return -ENOENT;
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}
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while (nf_pos < size) {
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@ -115,13 +121,8 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
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fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
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&elen, &offset);
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if (!fi) {
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if (fibh.sbh != fibh.ebh)
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brelse(fibh.ebh);
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brelse(fibh.sbh);
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brelse(epos.bh);
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return 0;
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}
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if (!fi)
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goto out;
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liu = le16_to_cpu(cfi.lengthOfImpUse);
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lfi = cfi.lengthFileIdent;
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@ -167,25 +168,21 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
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dt_type = DT_UNKNOWN;
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}
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if (flen) {
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if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0) {
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if (fibh.sbh != fibh.ebh)
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brelse(fibh.ebh);
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brelse(fibh.sbh);
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brelse(epos.bh);
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return 0;
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}
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}
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if (flen && filldir(dirent, fname, flen, filp->f_pos,
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iblock, dt_type) < 0)
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goto out;
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} /* end while */
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filp->f_pos = (nf_pos >> 2) + 1;
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out:
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if (fibh.sbh != fibh.ebh)
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brelse(fibh.ebh);
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brelse(fibh.sbh);
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brelse(epos.bh);
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kfree(fname);
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return 0;
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return ret;
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}
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static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
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128
fs/udf/namei.c
128
fs/udf/namei.c
@ -149,7 +149,7 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
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struct fileIdentDesc *fi = NULL;
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loff_t f_pos;
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int block, flen;
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char fname[UDF_NAME_LEN];
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char *fname = NULL;
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char *nameptr;
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uint8_t lfi;
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uint16_t liu;
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@ -163,12 +163,12 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
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size = udf_ext0_offset(dir) + dir->i_size;
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f_pos = udf_ext0_offset(dir);
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fibh->sbh = fibh->ebh = NULL;
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fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
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fibh->sbh = fibh->ebh = NULL;
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else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
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&epos, &eloc, &elen, &offset) ==
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(EXT_RECORDED_ALLOCATED >> 30)) {
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if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
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if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
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&eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
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goto out_err;
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block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
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if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
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@ -179,25 +179,19 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
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offset = 0;
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fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
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if (!fibh->sbh) {
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brelse(epos.bh);
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return NULL;
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}
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} else {
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brelse(epos.bh);
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return NULL;
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if (!fibh->sbh)
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goto out_err;
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}
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fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
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if (!fname)
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goto out_err;
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while (f_pos < size) {
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fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
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&elen, &offset);
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if (!fi) {
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if (fibh->sbh != fibh->ebh)
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brelse(fibh->ebh);
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brelse(fibh->sbh);
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brelse(epos.bh);
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return NULL;
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}
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if (!fi)
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goto out_err;
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liu = le16_to_cpu(cfi->lengthOfImpUse);
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lfi = cfi->lengthFileIdent;
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@ -237,18 +231,20 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
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flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
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if (flen && udf_match(flen, fname, dentry->d_name.len,
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dentry->d_name.name)) {
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brelse(epos.bh);
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return fi;
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}
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dentry->d_name.name))
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goto out_ok;
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}
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out_err:
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fi = NULL;
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if (fibh->sbh != fibh->ebh)
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brelse(fibh->ebh);
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brelse(fibh->sbh);
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out_ok:
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brelse(epos.bh);
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kfree(fname);
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return NULL;
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return fi;
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}
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static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
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@ -303,7 +299,7 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
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{
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struct super_block *sb = dir->i_sb;
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struct fileIdentDesc *fi = NULL;
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char name[UDF_NAME_LEN];
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char *name = NULL;
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int namelen;
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loff_t f_pos;
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loff_t size = udf_ext0_offset(dir) + dir->i_size;
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@ -317,16 +313,23 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
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struct extent_position epos = {};
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struct udf_inode_info *dinfo;
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fibh->sbh = fibh->ebh = NULL;
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name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
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if (!name) {
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*err = -ENOMEM;
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goto out_err;
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}
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if (dentry) {
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if (!dentry->d_name.len) {
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*err = -EINVAL;
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return NULL;
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goto out_err;
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}
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namelen = udf_put_filename(sb, dentry->d_name.name, name,
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dentry->d_name.len);
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if (!namelen) {
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*err = -ENAMETOOLONG;
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return NULL;
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goto out_err;
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}
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} else {
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namelen = 0;
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@ -338,11 +341,14 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
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fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
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dinfo = UDF_I(dir);
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
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fibh->sbh = fibh->ebh = NULL;
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else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
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&epos, &eloc, &elen, &offset) ==
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(EXT_RECORDED_ALLOCATED >> 30)) {
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if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
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if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
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&eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
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block = udf_get_lb_pblock(dir->i_sb,
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dinfo->i_location, 0);
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fibh->soffset = fibh->eoffset = sb->s_blocksize;
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goto add;
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}
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block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
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if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
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@ -354,17 +360,11 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
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fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
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if (!fibh->sbh) {
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brelse(epos.bh);
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*err = -EIO;
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return NULL;
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goto out_err;
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}
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block = dinfo->i_location.logicalBlockNum;
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} else {
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block = udf_get_lb_pblock(dir->i_sb, dinfo->i_location, 0);
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fibh->sbh = fibh->ebh = NULL;
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fibh->soffset = fibh->eoffset = sb->s_blocksize;
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goto add;
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}
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while (f_pos < size) {
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@ -372,12 +372,8 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
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&elen, &offset);
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if (!fi) {
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if (fibh->sbh != fibh->ebh)
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brelse(fibh->ebh);
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brelse(fibh->sbh);
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brelse(epos.bh);
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*err = -EIO;
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return NULL;
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goto out_err;
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}
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liu = le16_to_cpu(cfi->lengthOfImpUse);
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@ -386,7 +382,6 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
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if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
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if (((sizeof(struct fileIdentDesc) +
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liu + lfi + 3) & ~3) == nfidlen) {
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brelse(epos.bh);
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cfi->descTag.tagSerialNum = cpu_to_le16(1);
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cfi->fileVersionNum = cpu_to_le16(1);
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cfi->fileCharacteristics = 0;
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@ -394,10 +389,10 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
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cfi->lengthOfImpUse = cpu_to_le16(0);
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if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
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name))
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return fi;
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goto out_ok;
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else {
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*err = -EIO;
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return NULL;
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goto out_err;
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}
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}
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}
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@ -427,7 +422,7 @@ add:
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fibh->sbh = fibh->ebh =
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udf_expand_dir_adinicb(dir, &block, err);
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if (!fibh->sbh)
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return NULL;
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goto out_err;
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epos.block = dinfo->i_location;
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epos.offset = udf_file_entry_alloc_offset(dir);
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/* Load extent udf_expand_dir_adinicb() has created */
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@ -468,11 +463,8 @@ add:
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dir->i_sb->s_blocksize_bits);
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fibh->ebh = udf_bread(dir,
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f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
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if (!fibh->ebh) {
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brelse(epos.bh);
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brelse(fibh->sbh);
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return NULL;
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}
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if (!fibh->ebh)
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goto out_err;
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if (!fibh->soffset) {
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if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
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@ -503,20 +495,25 @@ add:
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cfi->lengthFileIdent = namelen;
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cfi->lengthOfImpUse = cpu_to_le16(0);
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if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
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brelse(epos.bh);
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dir->i_size += nfidlen;
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if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
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dinfo->i_lenAlloc += nfidlen;
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mark_inode_dirty(dir);
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return fi;
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goto out_ok;
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} else {
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brelse(epos.bh);
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if (fibh->sbh != fibh->ebh)
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brelse(fibh->ebh);
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brelse(fibh->sbh);
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*err = -EIO;
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return NULL;
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goto out_err;
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}
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out_err:
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fi = NULL;
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if (fibh->sbh != fibh->ebh)
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brelse(fibh->ebh);
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brelse(fibh->sbh);
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out_ok:
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brelse(epos.bh);
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kfree(name);
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return fi;
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}
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static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
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@ -871,7 +868,7 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry,
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char *ea;
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int err;
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int block;
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char name[UDF_NAME_LEN];
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char *name = NULL;
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int namelen;
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struct buffer_head *bh;
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struct udf_inode_info *iinfo;
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@ -881,6 +878,12 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry,
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if (!inode)
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goto out;
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name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
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if (!name) {
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err = -ENOMEM;
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goto out_no_entry;
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}
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iinfo = UDF_I(inode);
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inode->i_mode = S_IFLNK | S_IRWXUGO;
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inode->i_data.a_ops = &udf_symlink_aops;
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@ -1020,6 +1023,7 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry,
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err = 0;
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out:
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kfree(name);
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unlock_kernel();
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return err;
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