[Cluster-devel] [PATCH] gfs2: Don't leave s_fs_info pointing to freed memory in init_sbd
Andrew Price
anprice at redhat.com
Mon Oct 8 11:56:24 UTC 2018
When alloc_percpu() fails, sdp gets freed but sb->s_fs_info still points
to the same address. Move the assignment after that error check so that
s_fs_info can only point to a valid sdp or NULL, which is checked for
later in the error path, in gfs2_kill_super().
Reported-by: syzbot+dcb8b3587445007f5808 at syzkaller.appspotmail.com
Signed-off-by: Andrew Price <anprice at redhat.com>
---
fs/gfs2/ops_fstype.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index c2469833b4fb..4ec69d9783a8 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -72,13 +72,13 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb)
if (!sdp)
return NULL;
- sb->s_fs_info = sdp;
sdp->sd_vfs = sb;
sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
if (!sdp->sd_lkstats) {
kfree(sdp);
return NULL;
}
+ sb->s_fs_info = sdp;
set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
gfs2_tune_init(&sdp->sd_tune);
--
2.17.1
More information about the Cluster-devel
mailing list