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 mt76_rx_tid. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Felix Fietkau <n...@nbd.name> Cc: Lorenzo Bianconi <lore...@kernel.org> Cc: Ryder Lee <ryder....@mediatek.com> Cc: Shayne Chen <shayne.c...@mediatek.com> Cc: Sean Wang <sean.w...@mediatek.com> Cc: Kalle Valo <kv...@kernel.org> Cc: Matthias Brugger <matthias....@gmail.com> Cc: AngeloGioacchino Del Regno <angelogioacchino.delre...@collabora.com> Cc: linux-wirel...@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/net/wireless/mediatek/mt76/mt76.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index e8757865a3d0..03ef617b1527 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -376,7 +376,7 @@ struct mt76_rx_tid { u8 started:1, stopped:1, timer_pending:1; - struct sk_buff *reorder_buf[]; + struct sk_buff *reorder_buf[] __counted_by(size); }; #define MT_TX_CB_DMA_DONE BIT(0) -- 2.34.1
