linux-kernel - Re: [syzbot] WARNING: refcount bug in qrtr_node

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Message-ID: <CACT4Y+Z1OG0bPB-bfMRS6vN4Ogx8n3_8v+e+WCshLwz7apvnHg@mail.gmail.com>
Date:   Mon, 30 Aug 2021 10:39:18 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+c613e88b3093ebf3686e@...kaller.appspotmail.com>
Cc:     anant.thazhemadam@...il.com, bjorn.andersson@...aro.org,
        butterflyhuangxx@...il.com, davem@...emloft.net,
        dragonjetli@...il.com, hdanton@...a.com, kuba@...nel.org,
        linux-arm-msm@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org, mani@...nel.org,
        manivannan.sadhasivam@...aro.org, masahiroy@...nel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING: refcount bug in qrtr_node_lookup

On Sat, 28 Aug 2021 at 20:32, syzbot
<syzbot+c613e88b3093ebf3686e@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 7e78c597c3ebfd0cb329aa09a838734147e4f117
> Author: Xiaolong Huang <butterflyhuangxx@...il.com>
> Date:   Thu Aug 19 19:50:34 2021 +0000
>
>     net: qrtr: fix another OOB Read in qrtr_endpoint_post
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11279a4d300000
> start commit:   ba4f184e126b Linux 5.9-rc6
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=af502ec9a451c9fc
> dashboard link: https://syzkaller.appspot.com/bug?extid=c613e88b3093ebf3686e
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12263dd9900000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13d77603900000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: net: qrtr: fix another OOB Read in qrtr_endpoint_post
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Hi Hillf,

You posted some patch related to refcounts. Do you think "net: qrtr:
fix another OOB Read in qrtr_endpoint_post" is a plausible fix? Or is
there still something wrong with refcounts?