xfs: sanity check attr fork size

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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>

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Christoph Hellwig 2009-01-19 02:04:16 +01:00 • committed by Christoph Hellwig

parent 7884bc8617

commit 2809f76afc

1 changed files with 13 additions and 0 deletions

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fs/xfs/xfs_inode.c

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