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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