netdev - Re: KASAN: use-after-free Read in p9_fd

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Message-ID: <000000000000baac070596c1d4ae@google.com>
Date:   Thu, 07 Nov 2019 05:42:05 -0800
From:   syzbot <syzbot+0442e6e2f7e1e33b1037@...kaller.appspotmail.com>
To:     asmadeus@...ewreck.org, davem@...emloft.net,
        dominique.martinet@....fr, ericvh@...il.com, jiangyiwen@...ei.com,
        linux-kernel@...r.kernel.org, lucho@...kov.net,
        netdev@...r.kernel.org, rminnich@...dia.gov,
        syzkaller-bugs@...glegroups.com, tomasbortoli@...il.com,
        v9fs-developer@...ts.sourceforge.net
Subject: Re: KASAN: use-after-free Read in p9_fd_poll

syzbot suspects this bug was fixed by commit:

commit 430ac66eb4c5b5c4eb846b78ebf65747510b30f1
Author: Tomas Bortoli <tomasbortoli@...il.com>
Date:   Fri Jul 20 09:27:30 2018 +0000

     net/9p/trans_fd.c: fix race-condition by flushing workqueue before the  
kfree()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1646690c600000
start commit:   d72e90f3 Linux 4.18-rc6
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=68af3495408deac5
dashboard link: https://syzkaller.appspot.com/bug?extid=0442e6e2f7e1e33b1037
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1569b51c400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16e7a978400000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: net/9p/trans_fd.c: fix race-condition by flushing workqueue  
before the kfree()

For information about bisection process see: https://goo.gl/tpsmEJ#bisection