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Date: Fri,  6 Oct 2023 13:17:39 -0700
From: Kees Cook <>
To: Dmitry Torokhov <>
Cc: Kees Cook <>,
	"Gustavo A. R. Silva" <>,,,
	Nathan Chancellor <>,
	Nick Desaulniers <>,
	Tom Rix <>,,
Subject: [PATCH] Input: Annotate struct ff_device 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 via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family

As found with Coccinelle[1], add __counted_by for struct ff_device.

Cc: Dmitry Torokhov <>
Cc: "Gustavo A. R. Silva" <>
Link: [1]
Signed-off-by: Kees Cook <>
 include/linux/input.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/input.h b/include/linux/input.h
index 49790c1bd2c4..de6503c0edb8 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -562,7 +562,7 @@ struct ff_device {
 	int max_effects;
 	struct ff_effect *effects;
-	struct file *effect_owners[];
+	struct file *effect_owners[] __counted_by(max_effects);
 int input_ff_create(struct input_dev *dev, unsigned int max_effects);

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