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Subject: media: allegro: Annotate struct mcu_msg_push_buffers_internal with 
__counted_by
Author:  Kees Cook <keesc...@chromium.org>
Date:    Fri Sep 22 10:49:36 2023 -0700

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 mcu_msg_push_buffers_internal.

[1] 
https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Michael Tretter <m.tret...@pengutronix.de>
Cc: Pengutronix Kernel Team <ker...@pengutronix.de>
Signed-off-by: Kees Cook <keesc...@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavo...@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>

 drivers/media/platform/allegro-dvt/allegro-mail.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

---

diff --git a/drivers/media/platform/allegro-dvt/allegro-mail.h 
b/drivers/media/platform/allegro-dvt/allegro-mail.h
index a5686058d754..c0c9013f1aab 100644
--- a/drivers/media/platform/allegro-dvt/allegro-mail.h
+++ b/drivers/media/platform/allegro-dvt/allegro-mail.h
@@ -184,7 +184,7 @@ struct mcu_msg_push_buffers_internal {
        struct mcu_msg_header header;
        u32 channel_id;
        size_t num_buffers;
-       struct mcu_msg_push_buffers_internal_buffer buffer[];
+       struct mcu_msg_push_buffers_internal_buffer buffer[] 
__counted_by(num_buffers);
 };
 
 struct mcu_msg_put_stream_buffer {

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