tree a5909bdca6ea1a287717d6b88dc76b4fd72f3688
parent a30b0367978f75a2659c71b33739e5e445a363c8
author Dave Chinner <david@fromorbit.com> 1378166818 +1000
committer Ben Myers <bpm@sgi.com> 1378766638 -0500

xfs: check magic numbers in dir3 leaf verifier first

Calling xfs_dir3_leaf_hdr_from_disk() in a verifier before
validating the magic numbers in the buffer results in ASSERT
failures due to mismatching magic numbers when a corruption occurs.
Seeing as the verifier is supposed to catch the corruption and pass
it back to the caller, having the verifier assert fail on error
defeats the purpose of detecting the errors in the first place.

Check the magic numbers direct from the buffer before decoding the
header.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>