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authorAndrew Price <anprice@redhat.com>2018-10-08 15:52:43 +0300
committerBob Peterson <rpeterso@redhat.com>2018-10-08 15:52:43 +0300
commit4c62bd9cea7bcf10292f7e4c57a2bca332942697 (patch)
tree4f25341b2191bf08d1d0182e75cbdc50732fb0c7 /fs/gfs2
parente54c78a27fcdef406af799f360a93e6754adeefe (diff)
downloadlinux-4c62bd9cea7bcf10292f7e4c57a2bca332942697.tar.xz
gfs2: Don't leave s_fs_info pointing to freed memory in init_sbd
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@syzkaller.appspotmail.com Signed-off-by: Andrew Price <anprice@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/ops_fstype.c2
1 files changed, 1 insertions, 1 deletions
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);