[PATCH 4/7] regmap: use krealloc_array() in regmap_register_patch()

["Peng Fan (OSS)" <peng.fan@oss.nxp.com>]

From: Peng Fan <peng.fan@nxp.com>

Replace krealloc() with krealloc_array() in regmap_register_patch() to
gain the built-in overflow check on the element-count * element-size
multiplication, and switch to the early-return error style to reduce
nesting.

Assisted-by: LLM
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/base/regmap/regmap.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 0b40e1e7817c..b9830afa6d8e 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -3379,16 +3379,13 @@ int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs,
 	    num_regs))
 		return 0;
 
-	p = krealloc(map->patch,
-		     sizeof(struct reg_sequence) * (map->patch_regs + num_regs),
-		     GFP_KERNEL);
-	if (p) {
-		memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
-		map->patch = p;
-		map->patch_regs += num_regs;
-	} else {
+	p = krealloc_array(map->patch, map->patch_regs + num_regs, sizeof(*p), GFP_KERNEL);
+	if (!p)
 		return -ENOMEM;
-	}
+
+	memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
+	map->patch = p;
+	map->patch_regs += num_regs;
 
 	scoped_guard(regmap, map) {
 		bypass = map->cache_bypass;

-- 
2.51.0