[PATCH] pinctrl: uniphier: Annotate struct uniphier_pinctrl_reg_region with __counted_by

[Kees Cook]

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 checking 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 uniphier_pinctrl_reg_region.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Linus Walleij <linus.walleij at linaro.org>
Cc: Kunihiko Hayashi <hayashi.kunihiko at socionext.com>
Cc: Masami Hiramatsu <mhiramat at kernel.org>
Cc: linux-gpio at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Signed-off-by: Kees Cook <keescook at chromium.org>
---
 drivers/pinctrl/uniphier/pinctrl-uniphier-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
index 18d3a4f69e63..fbd0fcdb42c8 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
@@ -31,7 +31,7 @@ struct uniphier_pinctrl_reg_region {
 	struct list_head node;
 	unsigned int base;
 	unsigned int nregs;
-	u32 vals[];
+	u32 vals[] __counted_by(nregs);
 };
 
 struct uniphier_pinctrl_priv {
-- 
2.34.1