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

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Message-ID: <000000000000ba6a2d05ac300953@google.com>
Date:   Thu, 06 Aug 2020 00:00:05 -0700
From:   syzbot <syzbot+14e0e4960091ffae7cf7@...kaller.appspotmail.com>
To:     alex.aring@...il.com, davem@...emloft.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-wpan@...r.kernel.org,
        netdev@...r.kernel.org, stefan@...enfreihafen.org,
        syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com
Subject: Re: KASAN: use-after-free Read in __cfg8NUM_wpan_dev_from_attrs (2)

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