diff options
| author | Bob Peterson <rpeterso@redhat.com> | 2020-11-24 18:44:36 +0300 |
|---|---|---|
| committer | Andreas Gruenbacher <agruenba@redhat.com> | 2020-11-25 20:10:55 +0300 |
| commit | 778721510e84209f78e31e2ccb296ae36d623f5e (patch) | |
| tree | 96707ce63859f1cd210625c8b9da7701190d907a /fs/gfs2 | |
| parent | 515b269d5bd29a986d5e1c0a0cba87fa865a48b4 (diff) | |
| download | linux-778721510e84209f78e31e2ccb296ae36d623f5e.tar.xz | |
gfs2: check for empty rgrp tree in gfs2_ri_update
If gfs2 tries to mount a (corrupt) file system that has no resource
groups it still tries to set preferences on the first one, which causes
a kernel null pointer dereference. This patch adds a check to function
gfs2_ri_update so this condition is detected and reported back as an
error.
Reported-by: syzbot+e3f23ce40269a4c9053a@syzkaller.appspotmail.com
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/gfs2')
| -rw-r--r-- | fs/gfs2/rgrp.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index f7addc6197ed..5e8eef9990e3 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -985,6 +985,10 @@ static int gfs2_ri_update(struct gfs2_inode *ip) if (error < 0) return error; + if (RB_EMPTY_ROOT(&sdp->sd_rindex_tree)) { + fs_err(sdp, "no resource groups found in the file system.\n"); + return -ENOENT; + } set_rgrp_preferences(sdp); sdp->sd_rindex_uptodate = 1; |