xfs: check for dinode realtime flag corruption

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Ramon tested XFS with a modified version of fsfuzzer and hit a NULL
pointer dereference in __xfs_get_blocks due to the RT device target
pointer being NULL.

To fix this reject inode with the realtime bit set on a a filesystem
without an RT subvolume during inode read.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
Reported-by: Ramon de Carvalho Valle <ramon@risesecurity.org>
Tested-by: Ramon de Carvalho Valle <ramon@risesecurity.org>
Signed-off-by: Felix Blyakher <felixb@sgi.com>

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Christoph Hellwig 2009-08-10 11:32:18 -03:00 • committed by Felix Blyakher

parent 583e0e41ee

commit 16715dbe64

1 changed files with 10 additions and 0 deletions

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fs/xfs/xfs_inode.c

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