From: Schspa Shi schspa@gmail.com

commit a5201d42e2f8a8e8062103170027840ee372742f upstream.

When num_reg_defaults > 0 but reg_defaults is NULL, there will be a NULL pointer exception.

Current code has no such usage, but as additional hardening, also check this to prevent any chance of crashing.

Signed-off-by: Schspa Shi schspa@gmail.com Link: https://lore.kernel.org/r/20220629130951.63040-1-schspa@gmail.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Roman Smirnov r.smirnov@omp.ru --- drivers/base/regmap/regcache.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c index 7fdd702e564a..5ff79ba665ad 100644 --- a/drivers/base/regmap/regcache.c +++ b/drivers/base/regmap/regcache.c @@ -133,6 +133,12 @@ int regcache_init(struct regmap *map, const struct regmap_config *config) return -EINVAL; }

+ if (config->num_reg_defaults && !config->reg_defaults) { + dev_err(map->dev, + "Register defaults number are set without the reg!\n"); + return -EINVAL; + } + for (i = 0; i < config->num_reg_defaults; i++) if (config->reg_defaults[i].reg % map->reg_stride) return -EINVAL;