[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: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index bc8f27cc4483..702b88cbd91d 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1131,6 +1131,8 @@ static int blkdev_open(struct inode * inode, struct file * filp)
         filp->f_flags |= O_LARGEFILE;
 
         bdev = bd_acquire(inode);
+        if (bdev == NULL)
+                return -ENOMEM;
 
         res = do_open(bdev, filp, BD_MUTEX_NORMAL);
         if (res)