From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 5 Nov 2013 05:56:18 +0000 (+1100)
Subject: drivers/video/backlight/lm3630a_bl.c: potential NULL deref in probe()
X-Git-Tag: next-20131105~2^2~173
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fdc707c842134716e59de09a7cef2ca67d1b8ee9;p=karo-tx-linux.git

drivers/video/backlight/lm3630a_bl.c: potential NULL deref in probe()

We dereference "pdata" later in the function so we can't leave it as NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c
index 200dca04383f..d719a89a4381 100644
--- a/drivers/video/backlight/lm3630a_bl.c
+++ b/drivers/video/backlight/lm3630a_bl.c
@@ -389,22 +389,21 @@ static int lm3630a_probe(struct i2c_client *client,
 
 	i2c_set_clientdata(client, pchip);
 	if (pdata == NULL) {
-		pchip->pdata = devm_kzalloc(pchip->dev,
-					    sizeof(struct
-						   lm3630a_platform_data),
-					    GFP_KERNEL);
-		if (pchip->pdata == NULL)
+		pdata = devm_kzalloc(pchip->dev,
+				     sizeof(struct lm3630a_platform_data),
+				     GFP_KERNEL);
+		if (pdata == NULL)
 			return -ENOMEM;
 		/* default values */
-		pchip->pdata->leda_ctrl = LM3630A_LEDA_ENABLE;
-		pchip->pdata->ledb_ctrl = LM3630A_LEDB_ENABLE;
-		pchip->pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
-		pchip->pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
-		pchip->pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
-		pchip->pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
-	} else {
-		pchip->pdata = pdata;
+		pdata->leda_ctrl = LM3630A_LEDA_ENABLE;
+		pdata->ledb_ctrl = LM3630A_LEDB_ENABLE;
+		pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
+		pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
+		pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
+		pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
 	}
+	pchip->pdata = pdata;
+
 	/* chip initialize */
 	rval = lm3630a_chip_init(pchip);
 	if (rval < 0) {