From: Cong Ding <dinggnu@gmail.com>
Date: Wed, 20 Feb 2013 02:13:52 +0000 (+1100)
Subject: drivers/block/swim3.c: fix null pointer dereference
X-Git-Tag: next-20130220~1^2~612
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c8e2f2f6dd7668f41fcd77ac1d31cd21a8a6fdfe;p=karo-tx-linux.git

drivers/block/swim3.c: fix null pointer dereference

The use of pointer fs should be after the null check.

Signed-off-by: Cong Ding <dinggnu@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index 57763c54363a..758f2ac878cf 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -1090,10 +1090,13 @@ static const struct block_device_operations floppy_fops = {
 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
 {
 	struct floppy_state *fs = macio_get_drvdata(mdev);
-	struct swim3 __iomem *sw = fs->swim3;
+	struct swim3 __iomem *sw;
 
 	if (!fs)
 		return;
+
+	sw = fs->swim3;
+
 	if (mb_state != MB_FD)
 		return;