pinctrl: samsung: Annotate struct exynos_muxed_weint_data with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct
exynos_muxed_weint_data. Additionally, since the element count member
must be set before accessing the annotated flexible array member, move
its initialization earlier.

Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Alim Akhtar <alim.akhtar@samsung.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-gpio@vger.kernel.org
Cc: linux-hardening@vger.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20231006201707.work.405-kees@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.h b/drivers/pinctrl/samsung/pinctrl-exynos.h
index 7bd6d82c9f36..3ac52c2cf998 100644
--- a/drivers/pinctrl/samsung/pinctrl-exynos.h
+++ b/drivers/pinctrl/samsung/pinctrl-exynos.h
@@ -159,7 +159,7 @@ struct exynos_weint_data {
  */
 struct exynos_muxed_weint_data {
 	unsigned int nr_banks;
-	struct samsung_pin_bank *banks[];
+	struct samsung_pin_bank *banks[] __counted_by(nr_banks);
 };
 
 int exynos_eint_gpio_init(struct samsung_pinctrl_drv_data *d);