wifi: wcn36xx: Annotate struct wcn36xx_hal_ind_msg 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 wcn36xx_hal_ind_msg.

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

Cc: Loic Poulain <loic.poulain@linaro.org>
Cc: Kalle Valo <kvalo@kernel.org>
Cc: wcn36xx@lists.infradead.org
Cc: linux-wireless@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230915200622.never.820-kees@kernel.org

diff --git a/drivers/net/wireless/ath/wcn36xx/smd.h b/drivers/net/wireless/ath/wcn36xx/smd.h
index cf15cde2a364572e6ae4167319b59e9d7f276839..2c1ed9e570bfd1a7aeba585364c66decf1941955 100644 (file)
--- a/drivers/net/wireless/ath/wcn36xx/smd.h
+++ b/drivers/net/wireless/ath/wcn36xx/smd.h
@@ -47,7 +47,7 @@ struct wcn36xx_fw_msg_status_rsp {
 struct wcn36xx_hal_ind_msg {
        struct list_head list;
        size_t msg_len;
-       u8 msg[];
+       u8 msg[] __counted_by(msg_len);
 };
 
 struct wcn36xx;