From: Pankaj Dubey Date: Sat, 27 Sep 2014 04:17:55 +0000 (+0530) Subject: regmap: fix NULL pointer dereference in _regmap_write/read X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=a110e6d6ebac622c30c9d219b5b154d3d3167a20;p=linux-edison.git regmap: fix NULL pointer dereference in _regmap_write/read commit 5336be8416a71b5568d2cf54a2f2066abe9f2a53 upstream. 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 Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 4b5cf2e34e9..6a66f0b7d3d 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1177,7 +1177,7 @@ 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 @@ -1437,7 +1437,7 @@ 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