From 476301c15d44831413b94d54f248233b14c0ad85 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Fri, 15 Sep 2023 13:10:20 -0700
Subject: [PATCH] leds: mt6360: Annotate struct mt6360_priv with __counted_by
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 mt6360_priv.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230915201020.never.433-kees@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
---
drivers/leds/flash/leds-mt6360.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/leds/flash/leds-mt6360.c b/drivers/leds/flash/leds-mt6360.c
index 81401c481e2b9..a90de82f45683 100644
--- a/drivers/leds/flash/leds-mt6360.c
+++ b/drivers/leds/flash/leds-mt6360.c
@@ -91,7 +91,7 @@ struct mt6360_priv {
unsigned int fled_torch_used;
unsigned int leds_active;
unsigned int leds_count;
- struct mt6360_led leds[];
+ struct mt6360_led leds[] __counted_by(leds_count);
};
static int mt6360_mc_brightness_set(struct led_classdev *lcdev,