From: Schspa Shi <schspa@gmail.com>
To: broonie@kernel.org, gregkh@linuxfoundation.org, rafael@kernel.org
Cc: linux-kernel@vger.kernel.org, Schspa Shi <schspa@gmail.com>
Subject: [PATCH] regmap: cache: Add extra parameter check in regcache_init
Date: Wed, 29 Jun 2022 21:09:51 +0800 [thread overview]
Message-ID: <20220629130951.63040-1-schspa@gmail.com> (raw)
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
next reply other threads:[~2022-06-29 13:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-29 13:09 Schspa Shi [this message]
2022-06-30 13:32 ` [PATCH] regmap: cache: Add extra parameter check in regcache_init Mark Brown
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