[PATCH] pinctrl: qcom: tlmm-test: Add const to reg_names allocation type

[PATCH] pinctrl: qcom: tlmm-test: Add const to reg_names allocation type

[Kees Cook]

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

In preparation for converting the kmalloc family of allocators to the
type-aware kmalloc_obj family, we need to make sure that the returned
type from the allocation matches the type of the variable being
assigned. (The kmalloc family returns "void *", which can be implicitly
cast to any pointer type.)

The assigned type is "const char **", but the converted allocation type
would be "char **", which is the same type without the const qualifier.
As there is no general way to safely add 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/pinctrl/qcom/tlmm-test.o

Assisted-by: LLM coccinelle
Signed-off-by: Kees Cook <kees+treewide@kernel.org>
---
Cc: Bartosz Golaszewski <brgl@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>
Cc: Linus Walleij <linusw@kernel.org>
Cc: <linux-arm-msm@vger.kernel.org>
Cc: <linux-gpio@vger.kernel.org>
---
 drivers/pinctrl/qcom/tlmm-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/qcom/tlmm-test.c b/drivers/pinctrl/qcom/tlmm-test.c
index 13c417731be7..8bff92dc0d0b 100644
--- a/drivers/pinctrl/qcom/tlmm-test.c
+++ b/drivers/pinctrl/qcom/tlmm-test.c
@@ -587,7 +587,7 @@ static int tlmm_reg_base(struct device_node *tlmm, struct resource *res)
 		return count;
 	}
 
-	reg_names = kcalloc(count, sizeof(char *), GFP_KERNEL);
+	reg_names = kcalloc(count, sizeof(*reg_names), GFP_KERNEL);
 	if (!reg_names)
 		return -ENOMEM;
 
-- 
2.34.1

Re: [PATCH] pinctrl: qcom: tlmm-test: Add const to reg_names allocation type

[Konrad Dybcio]

On 9/17/26 11:10 PM, Kees Cook wrote:
> From: Kees Cook <kees+treewide@kernel.org>
> 
> In preparation for converting the kmalloc family of allocators to the
> type-aware kmalloc_obj family, we need to make sure that the returned
> type from the allocation matches the type of the variable being
> assigned. (The kmalloc family returns "void *", which can be implicitly
> cast to any pointer type.)
> 
> The assigned type is "const char **", but the converted allocation type
> would be "char **", which is the same type without the const qualifier.
> As there is no general way to safely add 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/pinctrl/qcom/tlmm-test.o
> 
> Assisted-by: LLM coccinelle
> Signed-off-by: Kees Cook <kees+treewide@kernel.org>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad