linux-kernel - [PATCH] staging: r8712u: fix potential NULL pointer dereference in r871x_wps

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Message-ID: <CAPgLHd8d0v6fjMGJnK2LbRWTyhRh4DQXXNyxWo10=0Y+GVk7FA@mail.gmail.com>
Date:	Mon, 8 Oct 2012 08:43:45 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
	gregkh@...uxfoundation.org
Cc:	yongjun_wei@...ndmicro.com.cn, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] staging: r8712u: fix potential NULL pointer dereference in r871x_wps_start()

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

The dereference should be moved below the NULL test.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/staging/rtl8712/rtl871x_ioctl_linux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
index c9a6a7f..3a64790 100644
--- a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
+++ b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
@@ -2110,10 +2110,10 @@ static int r871x_wps_start(struct net_device *dev,
 	struct iw_point *pdata = &wrqu->data;
 	u32   u32wps_start = 0;
 
-	if (copy_from_user((void *)&u32wps_start, pdata->pointer, 4))
-		return -EFAULT;
 	if ((padapter->bDriverStopped) || (pdata == NULL))
 		return -EINVAL;
+	if (copy_from_user((void *)&u32wps_start, pdata->pointer, 4))
+		return -EFAULT;
 	if (u32wps_start == 0)
 		u32wps_start = *extra;
 	if (u32wps_start == 1) /* WPS Start */

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