linux-kernel - [PATCH -next] mfd: sta2x11-mfd: fix potential NULL pointer dereference in __sta2x11_mfd

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Message-ID: <CAPgLHd9CsRsD6n7BMnXR__-VaTFUmG86JnDRvyN9J+XwXp7WDQ@mail.gmail.com>
Date:	Sun, 2 Dec 2012 08:33:56 -0500
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	sameo@...ux.intel.com
Cc:	yongjun_wei@...ndmicro.com.cn, linux-kernel@...r.kernel.org
Subject: [PATCH -next] mfd: sta2x11-mfd: fix potential NULL pointer
 dereference in __sta2x11_mfd_mask()

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

The dereference to 'mfd' should be moved below the NULL test.

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/mfd/sta2x11-mfd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/sta2x11-mfd.c b/drivers/mfd/sta2x11-mfd.c
index 012a521..1ecbdfb 100644
--- a/drivers/mfd/sta2x11-mfd.c
+++ b/drivers/mfd/sta2x11-mfd.c
@@ -116,12 +116,14 @@ u32 __sta2x11_mfd_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val,
 	struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
 	u32 r;
 	unsigned long flags;
-	void __iomem *regs = mfd->regs[index];
+	void __iomem *regs;
 
 	if (!mfd) {
 		dev_warn(&pdev->dev, ": can't access sctl regs\n");
 		return 0;
 	}
+
+	regs = mfd->regs[index];
 	if (!regs) {
 		dev_warn(&pdev->dev, ": system ctl not initialized\n");
 		return 0;


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