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 mt6370_priv. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Pavel Machek <pa...@ucw.cz> Cc: Lee Jones <l...@kernel.org> Cc: Matthias Brugger <matthias....@gmail.com> Cc: AngeloGioacchino Del Regno <angelogioacchino.delre...@collabora.com> Cc: Alice Chen <alice_c...@richtek.com> Cc: Jacek Anaszewski <jacek.anaszew...@gmail.com> Cc: ChiYuan Huang <cy_hu...@richtek.com> Cc: ChiaEn Wu <chiaen...@richtek.com> Cc: kernel test robot <l...@intel.com> Cc: linux-l...@vger.kernel.org Cc: linux-arm-ker...@lists.infradead.org Cc: linux-media...@lists.infradead.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- drivers/leds/flash/leds-mt6370-flash.c | 2 +- drivers/leds/rgb/leds-mt6370-rgb.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/leds/flash/leds-mt6370-flash.c b/drivers/leds/flash/leds-mt6370-flash.c index 931067c8a75f..912d9d622320 100644 --- a/drivers/leds/flash/leds-mt6370-flash.c +++ b/drivers/leds/flash/leds-mt6370-flash.c @@ -81,7 +81,7 @@ struct mt6370_priv { unsigned int fled_torch_used; unsigned int leds_active; unsigned int leds_count; - struct mt6370_led leds[]; + struct mt6370_led leds[] __counted_by(leds_count); }; static int mt6370_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level) diff --git a/drivers/leds/rgb/leds-mt6370-rgb.c b/drivers/leds/rgb/leds-mt6370-rgb.c index bb62431efe83..448d0da11848 100644 --- a/drivers/leds/rgb/leds-mt6370-rgb.c +++ b/drivers/leds/rgb/leds-mt6370-rgb.c @@ -153,7 +153,7 @@ struct mt6370_priv { const struct mt6370_pdata *pdata; unsigned int leds_count; unsigned int leds_active; - struct mt6370_led leds[]; + struct mt6370_led leds[] __counted_by(leds_count); }; static const struct reg_field common_reg_fields[F_MAX_FIELDS] = { -- 2.34.1
