linux-kernel - [PATCH] block: Check for valid bd_disk in bdev_get

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Message-Id: <1359538514-46908-1-git-send-email-hare@suse.de>
Date:	Wed, 30 Jan 2013 10:35:14 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jeff Mahoney <jeffm@...e.de>, Hannes Reinecke <hare@...e.de>
Subject: [PATCH] block: Check for valid bd_disk in bdev_get_queue()

bdev_get_queue() needs to check for a valid bd_disk pointer,
otherwise it'll dereference a NULL pointer.

Signed-off-by: Hannes Reinecke <hare@...e.de>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f94bc83..7e28aaa 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -794,7 +794,7 @@ extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
 
 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
 {
-	return bdev->bd_disk->queue;
+	return bdev->bd_disk ? bdev->bd_disk->queue : NULL;
 }
 
 /*
--
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