linux-kernel - Re: [PATCH] wireless: hostap: Fix a use after free in hostap_80211

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Date:   Thu, 24 Jun 2021 16:41:39 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Lv Yunlong <lyl2019@...l.ustc.edu.cn>
Cc:     j@...fi, davem@...emloft.net, kuba@...nel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lv Yunlong <lyl2019@...l.ustc.edu.cn>
Subject: Re: [PATCH] wireless: hostap: Fix a use after free in hostap_80211_rx

Lv Yunlong <lyl2019@...l.ustc.edu.cn> wrote:

> Function hostap_80211_rx() calls prism2_rx_80211(..,skb,..). In
> prism2_rx_80211, i found that the skb could be freed by dev_kfree_skb_any(skb)
> and return 0. Also could be freed by netif_rx(skb) when netif_rx return
> NET_RX_DROP.
> 
> But after called the prism2_rx_80211(..,skb,..), the skb is used by skb->len.
> 
> As the new skb->len is returned by prism2_rx_80211(), my patch uses a variable
> len to repalce skb->len. According to another useage of prism2_rx_80211 in
> monitor_rx().
> 
> Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>

Can someone help with reviewing the patch?

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20210329110021.7497-1-lyl2019@mail.ustc.edu.cn/

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