From: Pavel Emelianov <xemul@openvz.org>
Date: Sat, 28 Oct 2006 17:38:33 +0000 (-0700)
Subject: [PATCH] Fix potential OOPs in blkdev_open()
X-Git-Tag: v2.6.19-rc4~57
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a2aae06cc1e87e9712a26a639f6a2f3442e2027;p=linux-2.6

[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>
---

diff --git a/fs/block_dev.c b/fs/block_dev.c
index bc8f27cc44..702b88cbd9 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)