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gfs2: Fix NULL pointer dereference in gfs2_rgrp_dump

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When an rindex entry is found to be corrupt, compute_bitstructs() calls
gfs2_consist_rgrpd() which calls gfs2_rgrp_dump() like this:

    gfs2_rgrp_dump(NULL, rgd->rd_gl, fs_id_buf);

gfs2_rgrp_dump then dereferences the gl without checking it and we get

    BUG: KASAN: null-ptr-deref in gfs2_rgrp_dump+0x28/0x280

because there's no rgrp glock involved while reading the rindex on mount.

Fix this by changing gfs2_rgrp_dump to take an rgrp argument.

Reported-by: syzbot+43fa87986bdd31df9de6@syzkaller.appspotmail.com
Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andrew Price 2020-10-07 12:30:58 +01:00 committed by Andreas Gruenbacher
parent 2164f9b918
commit 0e539ca1bb
4 changed files with 15 additions and 9 deletions
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11
fs/gfs2/glops.c
View File

@ -227,6 +227,15 @@ static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
}
static void gfs2_rgrp_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
const char *fs_id_buf)
{
struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
if (rgd)
gfs2_rgrp_dump(seq, rgd, fs_id_buf);
}
static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
{
struct gfs2_inode *ip;
@ -712,7 +721,7 @@ const struct gfs2_glock_operations gfs2_rgrp_glops = {
.go_sync = rgrp_go_sync,
.go_inval = rgrp_go_inval,
.go_lock = gfs2_rgrp_go_lock,
.go_dump = gfs2_rgrp_dump,
.go_dump = gfs2_rgrp_go_dump,
.go_type = LM_TYPE_RGRP,
.go_flags = GLOF_LVB,
};

9
fs/gfs2/rgrp.c
View File

@ -2209,20 +2209,17 @@ static void rgblk_free(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd,
/**
* gfs2_rgrp_dump - print out an rgrp
* @seq: The iterator
* @gl: The glock in question
* @rgd: The rgrp in question
* @fs_id_buf: pointer to file system id (if requested)
*
*/
void gfs2_rgrp_dump(struct seq_file *seq, struct gfs2_glock *gl,
void gfs2_rgrp_dump(struct seq_file *seq, struct gfs2_rgrpd *rgd,
const char *fs_id_buf)
{
struct gfs2_rgrpd *rgd = gl->gl_object;
struct gfs2_blkreserv *trs;
const struct rb_node *n;
if (rgd == NULL)
return;
gfs2_print_dbg(seq, "%s R: n:%llu f:%02x b:%u/%u i:%u r:%u e:%u\n",
fs_id_buf,
(unsigned long long)rgd->rd_addr, rgd->rd_flags,
@ -2253,7 +2250,7 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
(unsigned long long)rgd->rd_addr);
fs_warn(sdp, "umount on all nodes and run fsck.gfs2 to fix the error\n");
sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);
gfs2_rgrp_dump(NULL, rgd->rd_gl, fs_id_buf);
gfs2_rgrp_dump(NULL, rgd, fs_id_buf);
rgd->rd_flags |= GFS2_RDF_ERROR;
}

2
fs/gfs2/rgrp.h
View File

@ -67,7 +67,7 @@ extern void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
extern void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist);
extern void gfs2_rlist_free(struct gfs2_rgrp_list *rlist);
extern u64 gfs2_ri_total(struct gfs2_sbd *sdp);
extern void gfs2_rgrp_dump(struct seq_file *seq, struct gfs2_glock *gl,
extern void gfs2_rgrp_dump(struct seq_file *seq, struct gfs2_rgrpd *rgd,
const char *fs_id_buf);
extern int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
struct buffer_head *bh,

2
fs/gfs2/util.c
View File

@ -419,7 +419,7 @@ void gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd,
char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);
gfs2_rgrp_dump(NULL, rgd->rd_gl, fs_id_buf);
gfs2_rgrp_dump(NULL, rgd, fs_id_buf);
gfs2_lm(sdp,
"fatal: filesystem consistency error\n"
" RG = %llu\n"