This is a note to let you know that I've just added the patch titled wifi: mt76: add memory barrier to SDIO queue kick to the 6.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: wifi-mt76-add-memory-barrier-to-sdio-queue-kick.patch and it can be found in the queue-6.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 852cdf2e558e119cbb5686b322fa85c2e861c304 Author: Deren Wu <deren.wu@xxxxxxxxxxxx> Date: Sun Jan 15 12:44:57 2023 +0800 wifi: mt76: add memory barrier to SDIO queue kick [ Upstream commit 5f54237ad798f41cb6a503271aa9ca47188cfb9b ] Ensure the entry has been fully updated before SDIO bus worker access it. This patch would fix potential memory risk in both mt7663s and mt7921s. Fixes: 764dee47e2c1 ("mt76: sdio: move common code in mt76_sdio module") Signed-off-by: Deren Wu <deren.wu@xxxxxxxxxxxx> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> Signed-off-by: Felix Fietkau <nbd@xxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/net/wireless/mediatek/mt76/sdio.c b/drivers/net/wireless/mediatek/mt76/sdio.c index 228bc7d45011c..419723118ded8 100644 --- a/drivers/net/wireless/mediatek/mt76/sdio.c +++ b/drivers/net/wireless/mediatek/mt76/sdio.c @@ -562,6 +562,10 @@ mt76s_tx_queue_skb_raw(struct mt76_dev *dev, struct mt76_queue *q, q->entry[q->head].buf_sz = len; q->entry[q->head].skb = skb; + + /* ensure the entry fully updated before bus access */ + smp_wmb(); + q->head = (q->head + 1) % q->ndesc; q->queued++;