linux-kernel - [PATCH] drm/msm: fix potential NULL pointer dereference

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Message-ID: <CAPgLHd8h4kV4U0g9orq_dLzB67UXTYXLQR_5dscyrBd=q6VERw@mail.gmail.com>
Date:	Wed, 11 Sep 2013 22:09:02 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	airlied@...ux.ie, robdclark@...il.com
Cc:	yongjun_wei@...ndmicro.com.cn, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/msm: fix potential NULL pointer dereference

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

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

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/gpu/drm/msm/msm_gpu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index e1e1ec9..6b50e6b 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -29,13 +29,14 @@
 static void bs_init(struct msm_gpu *gpu, struct platform_device *pdev)
 {
 	struct drm_device *dev = gpu->dev;
-	struct kgsl_device_platform_data *pdata = pdev->dev.platform_data;
+	struct kgsl_device_platform_data *pdata;
 
 	if (!pdev) {
 		dev_err(dev->dev, "could not find dtv pdata\n");
 		return;
 	}
 
+	pdata = pdev->dev.platform_data;
 	if (pdata->bus_scale_table) {
 		gpu->bsc = msm_bus_scale_register_client(pdata->bus_scale_table);
 		DBG("bus scale client: %08x", gpu->bsc);

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