[PATCH] Input: Annotate struct input_leds 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 input_leds.

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

Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: linux-input@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 drivers/input/input-leds.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c
index 0b11990ade46..0e935914bc3a 100644
--- a/drivers/input/input-leds.c
+++ b/drivers/input/input-leds.c
@@ -44,7 +44,7 @@ struct input_led {
 struct input_leds {
 	struct input_handle handle;
 	unsigned int num_leds;
-	struct input_led leds[];
+	struct input_led leds[] __counted_by(num_leds);
 };
 
 static enum led_brightness input_leds_brightness_get(struct led_classdev *cdev)
-- 
2.34.1