linux-kernel - Re: [syzbot] memory leak in __mdiobus

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Message-ID: <CAD-N9QUJWifqhNt09xDcu=w0K0o+wYUxpZyqkTs4q5eMp_kVgw@mail.gmail.com>
Date:   Tue, 28 Sep 2021 15:42:34 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     syzbot <syzbot+398e7dc692ddbbb4cfec@...kaller.appspotmail.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Pavel Skripkin <paskripkin@...il.com>, rafael@...nel.org,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] memory leak in __mdiobus_register

On Mon, Sep 27, 2021 at 7:44 AM syzbot
<syzbot+398e7dc692ddbbb4cfec@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
>
> Reported-and-tested-by: syzbot+398e7dc692ddbbb4cfec@...kaller.appspotmail.com
>
> Tested on:
>
> commit:         5816b3e6 Linux 5.15-rc3
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=41799858eb55f380
> dashboard link: https://syzkaller.appspot.com/bug?extid=398e7dc692ddbbb4cfec
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=1147b840b00000
>
> Note: testing is done by a robot and is best-effort only.

Hi Pavel,

Confirm the patch you posted [1] is the real fix of this bug report.

I tested the patch from Yanfei Xu [2] in my local workspace, and the
memory leak is still triggered. In addition, I have pushed a patch
request for that patch. The result would prove that patch is not
working for this bug.

BTW, there occur incorrect fix commits on the syzbot dashboard
sometimes. Maybe it should be cleaned in the future.

[1] https://lkml.org/lkml/2021/9/27/289
[2] https://www.spinics.net/lists/kernel/msg4089781.html

>
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