[PATCH] Fix potential OOPs in blkdev_open()
blkdev_open() calls bc_acquire() to get a struct block_device. Since bc_acquire() may return NULL when system is out of memory an appropriate check is required. Signed-off-by: NPavel Emelianov <xemul@openvz.org> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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