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 aw200xx. [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-aw200xx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c index 691a743cc9b0..4d517cace3e7 100644 --- a/drivers/leds/leds-aw200xx.c +++ b/drivers/leds/leds-aw200xx.c @@ -112,7 +112,7 @@ struct aw200xx { struct mutex mutex; u32 num_leds; u32 display_rows; - struct aw200xx_led leds[]; + struct aw200xx_led leds[] __counted_by(num_leds); }; static ssize_t dim_show(struct device *dev, struct device_attribute *devattr, -- 2.34.1
