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.torok...@gmail.com> Cc: linux-in...@vger.kernel.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- 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
