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>
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@ -322,7 +322,7 @@ xfs_filestream_lookup_ag(
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pip = xfs_filestream_get_parent(ip);
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if (!pip)
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goto out;
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return NULLAGNUMBER;
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mru = xfs_mru_cache_lookup(mp->m_filestream, pip->i_ino);
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if (mru) {
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