linux-kernel - [PATCH -next] gma500: medfield: fix potential NULL pointer dereference in mdfld_dsi_brightness

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Message-ID: <CAPgLHd_=F+YE-a2_MKV+Od655JiVMmymhKmhQZ1wTvQrfnjWVw@mail.gmail.com>
Date:	Sun, 2 Dec 2012 08:35:52 -0500
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	airlied@...ux.ie
Cc:	yongjun_wei@...ndmicro.com.cn, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH -next] gma500: medfield: fix potential NULL pointer
 dereference in mdfld_dsi_brightness_init()

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

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

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/gpu/drm/gma500/mdfld_dsi_output.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_output.c b/drivers/gpu/drm/gma500/mdfld_dsi_output.c
index 637dd84..478f8b9 100644
--- a/drivers/gpu/drm/gma500/mdfld_dsi_output.c
+++ b/drivers/gpu/drm/gma500/mdfld_dsi_output.c
@@ -92,8 +92,8 @@ void mdfld_dsi_brightness_init(struct mdfld_dsi_config *dsi_config, int pipe)
 {
 	struct mdfld_dsi_pkg_sender *sender =
 				mdfld_dsi_get_pkg_sender(dsi_config);
-	struct drm_device *dev = sender->dev;
-	struct drm_psb_private *dev_priv = dev->dev_private;
+	struct drm_device *dev;
+	struct drm_psb_private *dev_priv;
 	u32 gen_ctrl_val;
 
 	if (!sender) {
@@ -101,6 +101,8 @@ void mdfld_dsi_brightness_init(struct mdfld_dsi_config *dsi_config, int pipe)
 		return;
 	}
 
+	dev = sender->dev;
+	dev_priv = dev->dev_private;
 	/* Set default display backlight value to 85% (0xd8)*/
 	mdfld_dsi_send_mcs_short(sender, write_display_brightness, 0xd8, 1,
 				true);


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