Jia-Ju Bai <baijiaju1990@xxxxxxxxx> wrote: > In rtl92ce_tx_fill_cmddesc(), skb->data is mapped to streaming DMA on > line 530: > dma_addr_t mapping = dma_map_single(..., skb->data, ...); > > On line 533, skb->data is assigned to hdr after cast: > struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data); > > Then hdr->frame_control is accessed on line 534: > __le16 fc = hdr->frame_control; > > This DMA access may cause data inconsistency between CPU and hardwre. > > To fix this bug, hdr->frame_control is accessed before the DMA mapping. > > Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx> Like Ping said, use "rtlwifi:" prefix and have all rtlwifi patches in the same patchset. 4 patches set to Changes Requested. 11843533 rtl8192ce: avoid accessing the data mapped to streaming DMA 11843541 rtl8192de: avoid accessing the data mapped to streaming DMA 11843553 rtl8723ae: avoid accessing the data mapped to streaming DMA 11843557 rtl8188ee: avoid accessing the data mapped to streaming DMA -- https://patchwork.kernel.org/project/linux-wireless/patch/20201019030931.4796-1-baijiaju1990@xxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
