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xfs: fix NULL pointer dereference in xfs_filestream_lookup_ag()

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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>
This commit is contained in:
Eric Sandeen 2015-03-25 14:54:25 +11:00 committed by Dave Chinner
parent d64588ca28
commit b26384dc52
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_filestream.c
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@ -322,7 +322,7 @@ xfs_filestream_lookup_ag(
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) {