tree 7788c8a92da9c9859cf40fdd0c1c471debf5035c
parent 49739140e57a65114d9e1976c4c158d2145595fb
author Christoph Hellwig <hch@lst.de> 1232327056 +0100
committer Lachlan McIlroy <lachlan@sgi.com> 1232336711 +1100

xfs: sanity check attr fork size

Recently we have quite a few kerneloops reports about dereferencing a NULL
if_data in the attribute fork.  From looking over the code this can only
happen if we pass a 0 size argument to xfs_iformat_local.  This implies some
sort of corruption and in fact the only mailinglist report about this from
earlier this year was after a powerfail presumably on a system with write
cache and without barriers.

Add a quick sanity check for the attr fork size in xfs_iformat to catch
these early and without an oops.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>