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>
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 @@
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)