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@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 78f43fb2fe84647d5e97d5c9f6468cf6c8704187..b903aff59af392b7bda6de21400db9fcacccf4b9 100644 (file)
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1408,7 +1408,7 @@ 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
 
@@ -2058,7 +2058,7 @@ 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