regmap: validate regmap_raw_read/write val_len

val_len should be a multiple of val_bytes. If it's not, error out early.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

drivers/base/regmap/regmap.c

@@ -621,6 +621,9 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
 {
 	int ret;
 
+	if (val_len % map->format.val_bytes)
+		return -EINVAL;
+
 	map->lock(map);
 
 	ret = _regmap_raw_write(map, reg, val, val_len);
@@ -779,6 +782,9 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 	unsigned int v;
 	int ret, i;
 
+	if (val_len % map->format.val_bytes)
+		return -EINVAL;
+
 	map->lock(map);
 
 	if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||