Same bug as mt7615: buf[1].len is overridden to MT_CT_PARSE_LEN (72) but the DMA mapping may cover fewer bytes, causing SMMU faults when hardware reads past the mapped region. Cap the firmware parse length to the actual DMA-mapped length. Fixes: c17780e7b21e ("mt76: mt7915: add txfree event v3") Cc: stable@vger.kernel.org Signed-off-by: Joshua Klinesmith --- drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c index cec2c4208255..b66c440dbef3 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c @@ -799,7 +799,7 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr, tx_info->skb = NULL; /* pass partial skb header to fw */ - tx_info->buf[1].len = MT_CT_PARSE_LEN; + tx_info->buf[1].len = min_t(u32, MT_CT_PARSE_LEN, tx_info->buf[1].len); tx_info->buf[1].skip_unmap = true; tx_info->nbuf = MT_CT_DMA_BUF_NUM; -- 2.43.0