Jia-Ju Bai <baijiaju1990@xxxxxxxxx> wrote: > In rtl88ee_tx_fill_cmddesc(), skb->data is mapped to streaming DMA on > line 677: > dma_addr_t mapping = dma_map_single(..., skb->data, ...); > > On line 680, 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 681: > __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> 4 patches applied to wireless-drivers-next.git, thanks. 6df3c293d284 rtlwifi: rtl8188ee: avoid accessing the data mapped to streaming DMA c7ba0ea0df37 rtlwifi: rtl8192ce: avoid accessing the data mapped to streaming DMA ff7654833894 rtlwifi: rtl8192de: avoid accessing the data mapped to streaming DMA 8b2c13b2e5da rtlwifi: rtl8723ae: avoid accessing the data mapped to streaming DMA -- https://patchwork.kernel.org/project/linux-wireless/patch/20201119015127.12033-1-baijiaju1990@xxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
