lkml.org 
[lkml]   [2020]   [Sep]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: p54: avoid accessing the data mapped to streaming DMA
From
Date
Jia-Ju Bai <baijiaju@tsinghua.edu.cn> wrote:

> In p54p_tx(), skb->data is mapped to streaming DMA on line 337:
> mapping = pci_map_single(..., skb->data, ...);
>
> Then skb->data is accessed on line 349:
> desc->device_addr = ((struct p54_hdr *)skb->data)->req_id;
>
> This access may cause data inconsistency between CPU cache and hardware.
>
> To fix this problem, ((struct p54_hdr *)skb->data)->req_id is stored in
> a local variable before DMA mapping, and then the driver accesses this
> local variable instead of skb->data.
>
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Jia-Ju Bai <baijiaju@tsinghua.edu.cn>
> Acked-by: Christian Lamparter <chunkeey@gmail.com>

Patch applied to wireless-drivers-next.git, thanks.

478762855b5a p54: avoid accessing the data mapped to streaming DMA

--
https://patchwork.kernel.org/patch/11696391/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

\
 
 \ /
  Last update: 2020-09-01 11:35    [W:0.053 / U:0.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site