linux-kernel - [PATCH 1/1] regcache: flat: Require max

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Message-Id: <1459234412-27192-1-git-send-email-alexander.stein@systec-electronic.com>
Date:	Tue, 29 Mar 2016 08:53:32 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] regcache: flat: Require max_registers to be set

If max_register is unset, regcache_flat_get_index will return 0 and only
memory for 1 unsigned int will be allocated, resulting in writing out
of bounds.

Signed-off-by: Alexander Stein <alexander.stein@...tec-electronic.com>
---
 drivers/base/regmap/regcache-flat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regcache-flat.c b/drivers/base/regmap/regcache-flat.c
index 3ee7255..4d2e50b 100644
--- a/drivers/base/regmap/regcache-flat.c
+++ b/drivers/base/regmap/regcache-flat.c
@@ -27,7 +27,7 @@ static int regcache_flat_init(struct regmap *map)
 	int i;
 	unsigned int *cache;
 
-	if (!map || map->reg_stride_order < 0)
+	if (!map || map->reg_stride_order < 0 || !map->max_register)
 		return -EINVAL;
 
 	map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)
-- 
2.7.3