linux-kernel - [PATCH] block: swim3.c: fix null pointer dereference

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Date:	Mon, 14 Jan 2013 17:20:38 +0000
From:	Cong Ding <dinggnu@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kent Overstreet <koverstreet@...gle.com>,
	linux-kernel@...r.kernel.org
Cc:	Cong Ding <dinggnu@...il.com>
Subject: [PATCH] block: swim3.c: fix null pointer dereference

the use if pointer fs should be after the null check.

Signed-off-by: Cong Ding <dinggnu@...il.com>
---
 drivers/block/swim3.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index d889f95..deb722d 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;
 
-- 
1.7.9.5

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