xfs: fix NULL pointer dereference in xfs_filestream_lookup_ag()
If xfs_filestream_get_parent() fails, we have a null pip,
goto out, and attempt to IRELE(NULL). This causes a null
pointer dereference and BUG().
Fix this by directly returning NULLAGNUMBER in this case.
Reported-by: Adrien Nader <adrien@notk.org>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_filestream.c b/fs/xfs/xfs_filestream.c
index a2e86e8..8f9f854 100644
--- a/fs/xfs/xfs_filestream.c
+++ b/fs/xfs/xfs_filestream.c
@@ -322,7 +322,7 @@
pip = xfs_filestream_get_parent(ip);
if (!pip)
- goto out;
+ return NULLAGNUMBER;
mru = xfs_mru_cache_lookup(mp->m_filestream, pip->i_ino);
if (mru) {