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Six small cifs/smb3 fixes, 2 for stable

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Merge tag '5.15-rc2-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "Six small cifs/smb3 fixes, two for stable:

   - important fix for deferred close (found by a git functional test)
     related to attribute caching on close.

   - four (two cosmetic, two more serious) small fixes for problems
     pointed out by smatch via Dan Carpenter

   - fix for comment formatting problems pointed out by W=1"

* tag '5.15-rc2-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: fix incorrect check for null pointer in header_assemble
  smb3: correct server pointer dereferencing check to be more consistent
  smb3: correct smb3 ACL security descriptor
  cifs: Clear modified attribute bit from inode flags
  cifs: Deal with some warnings from W=1
  cifs: fix a sign extension bug
This commit is contained in:
Linus Torvalds 2021-09-25 11:08:12 -07:00
commit b8f4296560
4 changed files with 21 additions and 9 deletions
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5
fs/cifs/connect.c
View File

@ -2389,9 +2389,10 @@ cifs_match_super(struct super_block *sb, void *data)
spin_lock(&cifs_tcp_ses_lock);
cifs_sb = CIFS_SB(sb);
tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
if (IS_ERR(tlink)) {
if (tlink == NULL) {
/* can not match superblock if tlink were ever null */
spin_unlock(&cifs_tcp_ses_lock);
return rc;
return 0;
}
tcon = tlink_tcon(tlink);
ses = tcon->ses;

4
fs/cifs/file.c
View File

@ -884,7 +884,7 @@ int cifs_close(struct inode *inode, struct file *file)
cinode->lease_granted &&
!test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags) &&
dclose) {
if (test_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) {
if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) {
inode->i_ctime = inode->i_mtime = current_time(inode);
cifs_fscache_update_inode_cookie(inode);
}
@ -3113,7 +3113,7 @@ static void collect_uncached_write_data(struct cifs_aio_ctx *ctx)
struct cifs_tcon *tcon;
struct cifs_sb_info *cifs_sb;
struct dentry *dentry = ctx->cfile->dentry;
int rc;
ssize_t rc;
tcon = tlink_tcon(ctx->cfile->tlink);
cifs_sb = CIFS_SB(dentry->d_sb);

17
fs/cifs/misc.c
View File

@ -264,7 +264,8 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
/* Uid is not converted */
buffer->Uid = treeCon->ses->Suid;
buffer->Mid = get_next_mid(treeCon->ses->server);
if (treeCon->ses->server)
buffer->Mid = get_next_mid(treeCon->ses->server);
}
if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
buffer->Flags2 |= SMBFLG2_DFS;
@ -590,6 +591,7 @@ void cifs_put_writer(struct cifsInodeInfo *cinode)
/**
* cifs_queue_oplock_break - queue the oplock break handler for cfile
* @cfile: The file to break the oplock on
*
* This function is called from the demultiplex thread when it
* receives an oplock break for @cfile.
@ -1065,6 +1067,9 @@ setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw)
/**
* cifs_alloc_hash - allocate hash and hash context together
* @name: The name of the crypto hash algo
* @shash: Where to put the pointer to the hash algo
* @sdesc: Where to put the pointer to the hash descriptor
*
* The caller has to make sure @sdesc is initialized to either NULL or
* a valid context. Both can be freed via cifs_free_hash().
@ -1103,6 +1108,8 @@ cifs_alloc_hash(const char *name,
/**
* cifs_free_hash - free hash and hash context together
* @shash: Where to find the pointer to the hash algo
* @sdesc: Where to find the pointer to the hash descriptor
*
* Freeing a NULL hash or context is safe.
*/
@ -1118,8 +1125,10 @@ cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc)
/**
* rqst_page_get_length - obtain the length and offset for a page in smb_rqst
* Input: rqst - a smb_rqst, page - a page index for rqst
* Output: *len - the length for this page, *offset - the offset for this page
* @rqst: The request descriptor
* @page: The index of the page to query
* @len: Where to store the length for this page:
* @offset: Where to store the offset for this page
*/
void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page,
unsigned int *len, unsigned int *offset)
@ -1152,6 +1161,8 @@ void extract_unc_hostname(const char *unc, const char **h, size_t *len)
/**
* copy_path_name - copy src path to dst, possibly truncating
* @dst: The destination buffer
* @src: The source name
*
* returns number of bytes written (including trailing nul)
*/

4
fs/cifs/smb2pdu.c
View File

@ -2397,7 +2397,7 @@ create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
/* Ship the ACL for now. we will copy it into buf later. */
aclptr = ptr;
ptr += sizeof(struct cifs_acl);
ptr += sizeof(struct smb3_acl);
/* create one ACE to hold the mode embedded in reserved special SID */
acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
@ -2422,7 +2422,7 @@ create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
acl.AclSize = cpu_to_le16(acl_size);
acl.AceCount = cpu_to_le16(ace_count);
memcpy(aclptr, &acl, sizeof(struct cifs_acl));
memcpy(aclptr, &acl, sizeof(struct smb3_acl));
buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
*len = roundup(ptr - (__u8 *)buf, 8);