[PATCH] extcon: realtek: Remove const from type_c_cfg allocation type

[Kees Cook <kees@kernel.org>]

From: Kees Cook <kees+treewide@kernel.org>

In preparation for making the devm_kmalloc family of allocators type
aware, we need to make sure that the returned type from the allocation
matches the type of the variable being assigned. (Before, the allocator
would always return "void *", which can be implicitly cast to any
pointer type.)

The assigned type is "struct type_c_cfg *", but the converted allocation
type would be "const struct type_c_cfg *", as the size was taken from
the local "type_c_cfg", which points to const as it comes from
of_device_get_match_data(). As there is no general way to remove const
qualifiers, take the size from the assignment target instead. No change
in allocation size results.

Build tested ARCH=x86_64 allmodconfig with GCC 16.2.0:
drivers/extcon/extcon-rtk-type-c.o

Assisted-by: LLM coccinelle
Signed-off-by: Kees Cook <kees+treewide@kernel.org>
---
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
---
 drivers/extcon/extcon-rtk-type-c.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/extcon/extcon-rtk-type-c.c b/drivers/extcon/extcon-rtk-type-c.c
index 82b60b927e41..da0b3fd3676e 100644
--- a/drivers/extcon/extcon-rtk-type-c.c
+++ b/drivers/extcon/extcon-rtk-type-c.c
@@ -1368,7 +1368,8 @@ static int extcon_rtk_type_c_probe(struct platform_device *pdev)
 		goto err;
 	}
 
-	type_c->type_c_cfg = devm_kzalloc(dev, sizeof(*type_c_cfg), GFP_KERNEL);
+	type_c->type_c_cfg = devm_kzalloc(dev, sizeof(*type_c->type_c_cfg),
+					  GFP_KERNEL);
 	if (!type_c->type_c_cfg)
 		return -ENOMEM;
 
-- 
2.34.1