linux-kernel - [PATCH] regmap: fix NULL pointer dereference in _regmap

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Message-id: <1411791475-27031-1-git-send-email-pankaj.dubey@samsung.com>
Date:	Sat, 27 Sep 2014 09:47:55 +0530
From:	Pankaj Dubey <pankaj.dubey@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	broonie@...nel.org, gregkh@...uxfoundation.org,
	Li.Xiubo@...escale.com, naushad@...sung.com,
	Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: [PATCH] regmap: fix NULL pointer dereference in _regmap_write/read

If LOG_DEVICE is defined and map->dev is NULL it will lead to NULL
pointer dereference. This patch fixes this issue by adding check for
dev->NULL in all such places in regmap.c

Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
---
 drivers/base/regmap/regmap.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 455a877..9980044 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1465,7 +1465,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
 	}
 
 #ifdef LOG_DEVICE
-	if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+	if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
 		dev_info(map->dev, "%x <= %x\n", reg, val);
 #endif
 
@@ -2115,7 +2115,7 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
 	ret = map->reg_read(context, reg, val);
 	if (ret == 0) {
 #ifdef LOG_DEVICE
-		if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+		if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
 			dev_info(map->dev, "%x => %x\n", reg, *val);
 #endif
 
-- 
1.7.9.5

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