linux-kernel - Re: [PATCH] net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf

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Date:   Mon, 26 Apr 2021 20:40:09 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Lv Yunlong <lyl2019@...l.ustc.edu.cn>
Cc:     timur@...nel.org, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net:emac/emac-mac: Fix a use after free in
 emac_mac_tx_buf_send

Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Mon, 26 Apr 2021 09:06:25 -0700 you wrote:
> In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).
> If some error happens in emac_tx_fill_tpd(), the skb will be freed via
> dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().
> But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len).
> 
> As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len,
> thus my patch assigns skb->len to 'len' before the possible free and
> use 'len' instead of skb->len later.
> 
> [...]

Here is the summary with links:
  - net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send
    https://git.kernel.org/netdev/net-next/c/6d72e7c767ac

You are awesome, thank you!
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