linux-kernel - Re: [PATCH net V2] net/x25: Fix null-ptr-deref caused by x25

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Date:   Sat, 26 Mar 2022 18:50:10 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Duoming Zhou <duoming@....edu.cn>
Cc:     linux-x25@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ms@....tdt.de, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, tanxin.ctf@...il.com,
        xiyuyang19@...an.edu.cn, linma@....edu.cn
Subject: Re: [PATCH net V2] net/x25: Fix null-ptr-deref caused by x25_disconnect

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Sat, 26 Mar 2022 18:43:46 +0800 you wrote:
> When the link layer is terminating, x25->neighbour will be set to NULL
> in x25_disconnect(). As a result, it could cause null-ptr-deref bugs in
> x25_sendmsg(),x25_recvmsg() and x25_connect(). One of the bugs is
> shown below.
> 
>     (Thread 1)                 |  (Thread 2)
> x25_link_terminated()          | x25_recvmsg()
>  x25_kill_by_neigh()           |  ...
>   x25_disconnect()             |  lock_sock(sk)
>    ...                         |  ...
>    x25->neighbour = NULL //(1) |
>    ...                         |  x25->neighbour->extended //(2)
> 
> [...]

Here is the summary with links:
  - [net,V2] net/x25: Fix null-ptr-deref caused by x25_disconnect
    https://git.kernel.org/netdev/net/c/7781607938c8

You are awesome, thank you!
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