linux-kernel - Re: KASAN: use-after-free Read in __cfg8NUM_wpan_dev_from

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Message-ID: <CACT4Y+ZFqCBRhnJxv09QEZqm3eNym5vyLUHGpZfHY58DQ=YLKQ@mail.gmail.com>
Date:   Wed, 11 Nov 2020 12:24:00 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+14e0e4960091ffae7cf7@...kaller.appspotmail.com>
Cc:     alex.aring@...il.com, David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-wpan@...r.kernel.org,
        netdev <netdev@...r.kernel.org>, stefan@...enfreihafen.org,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: KASAN: use-after-free Read in __cfg8NUM_wpan_dev_from_attrs (2)

On Thu, Aug 6, 2020 at 9:00 AM syzbot
<syzbot+14e0e4960091ffae7cf7@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit bf64ff4c2aac65d680dc639a511c781cf6b6ec08
> Author: Cong Wang <xiyou.wangcong@...il.com>
> Date:   Sat Jun 27 07:12:24 2020 +0000
>
>     genetlink: get rid of family->attrbuf
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12069494900000
> start commit:   e44f65fd xen-netfront: remove redundant assignment to vari..
> git tree:       net-next
> kernel config:  https://syzkaller.appspot.com/x/.config?x=829871134ca5e230
> dashboard link: https://syzkaller.appspot.com/bug?extid=14e0e4960091ffae7cf7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11818aa7100000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10f997d3100000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: genetlink: get rid of family->attrbuf
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: genetlink: get rid of family->attrbuf