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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@systec-electronic.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alexander Stein 2016-03-29 08:53:32 +02:00 committed by Mark Brown
parent f55532a0c0
commit 6e4f28780f
1 changed files with 1 additions and 1 deletions
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2
drivers/base/regmap/regcache-flat.c
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@ -27,7 +27,7 @@ static int regcache_flat_init(struct regmap *map)
int i; int i;
unsigned int *cache; unsigned int *cache;
if (!map || map->reg_stride_order < 0) if (!map || map->reg_stride_order < 0 || !map->max_register)
return -EINVAL; return -EINVAL;
map->cache = kcalloc(regcache_flat_get_index(map, map->max_register) map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)