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Subject[PATCH] regmap: fix NULL pointer dereference in _regmap_write/read
Date
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>
---
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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