[PATCH] leds: cr0014114: Annotate struct cr0014114 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 cr0014114.

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

Cc: Pavel Machek <pavel@xxxxxx>
Cc: Lee Jones <lee@xxxxxxxxxx>
Cc: linux-leds@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 drivers/leds/leds-cr0014114.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/leds/leds-cr0014114.c b/drivers/leds/leds-cr0014114.c
index b33bca397ea6..c9914fc51f20 100644
--- a/drivers/leds/leds-cr0014114.c
+++ b/drivers/leds/leds-cr0014114.c
@@ -56,7 +56,7 @@ struct cr0014114 {
 	struct spi_device	*spi;
 	u8			*buf;
 	unsigned long		delay;
-	struct cr0014114_led	leds[];
+	struct cr0014114_led	leds[] __counted_by(count);
 };
 
 static void cr0014114_calc_crc(u8 *buf, const size_t len)
-- 
2.34.1