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Subject[PATCH] regmap: cache: Add extra parameter check in regcache_init
Date
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>
---
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 d0f5bc827978..d8c31c8ac4a0 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;
--
2.29.0
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