linux-kernel - Re: [PATCH net] net: qrtr: Fix a refcount bug in qrtr

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Message-Id: <168025081712.23963.16327516163139075912.git-patchwork-notify@kernel.org>
Date:   Fri, 31 Mar 2023 08:20:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Ziyang Xuan <william.xuanziyang@...wei.com>
Cc:     mani@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, linux-arm-msm@...r.kernel.org,
        netdev@...r.kernel.org, andersson@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: qrtr: Fix a refcount bug in qrtr_recvmsg()

Hello:

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

On Thu, 30 Mar 2023 09:25:32 +0800 you wrote:
> Syzbot reported a bug as following:
> 
> refcount_t: addition on 0; use-after-free.
> ...
> RIP: 0010:refcount_warn_saturate+0x17c/0x1f0 lib/refcount.c:25
> ...
> Call Trace:
>  <TASK>
>  __refcount_add include/linux/refcount.h:199 [inline]
>  __refcount_inc include/linux/refcount.h:250 [inline]
>  refcount_inc include/linux/refcount.h:267 [inline]
>  kref_get include/linux/kref.h:45 [inline]
>  qrtr_node_acquire net/qrtr/af_qrtr.c:202 [inline]
>  qrtr_node_lookup net/qrtr/af_qrtr.c:398 [inline]
>  qrtr_send_resume_tx net/qrtr/af_qrtr.c:1003 [inline]
>  qrtr_recvmsg+0x85f/0x990 net/qrtr/af_qrtr.c:1070
>  sock_recvmsg_nosec net/socket.c:1017 [inline]
>  sock_recvmsg+0xe2/0x160 net/socket.c:1038
>  qrtr_ns_worker+0x170/0x1700 net/qrtr/ns.c:688
>  process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
>  worker_thread+0x669/0x1090 kernel/workqueue.c:2537
> 
> [...]

Here is the summary with links:
  - [net] net: qrtr: Fix a refcount bug in qrtr_recvmsg()
    https://git.kernel.org/netdev/net/c/44d807320000

You are awesome, thank you!
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