[PATCH] leds: el15203000: Annotate struct el15203000 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 el15203000.

[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-el15203000.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/leds/leds-el15203000.c b/drivers/leds/leds-el15203000.c
index 7e7b617bcd56..d40194a3029f 100644
--- a/drivers/leds/leds-el15203000.c
+++ b/drivers/leds/leds-el15203000.c
@@ -80,7 +80,7 @@ struct el15203000 {
 	struct spi_device	*spi;
 	unsigned long		delay;
 	size_t			count;
-	struct el15203000_led	leds[];
+	struct el15203000_led	leds[] __counted_by(count);
 };
 
 #define to_el15203000_led(d)	container_of(d, struct el15203000_led, ldev)
-- 
2.34.1