This fixes a possible NULL pointer dereference oops in
regmap_name_read_file() when the regmap does not have a device
associated with it. For example syscon regmaps retrieved with
syscon_regmap_lookup_by_compatible() don't have a device.
Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
loff_t *ppos)
{
struct regmap *map = file->private_data;
+ const char *name = "nodev";
int ret;
char *buf;
if (!buf)
return -ENOMEM;
- ret = snprintf(buf, PAGE_SIZE, "%s\n", map->dev->driver->name);
+ if (map->dev && map->dev->driver)
+ name = map->dev->driver->name;
+
+ ret = snprintf(buf, PAGE_SIZE, "%s\n", name);
if (ret < 0) {
kfree(buf);
return ret;