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

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Message-ID: <20200605041859.GJ2667@sol.localdomain>
Date:   Thu, 4 Jun 2020 21:18:59 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     syzbot <syzbot+20458a5eab138777efc9@...kaller.appspotmail.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>, brendanhiggins@...gle.com,
        dmitry.torokhov@...il.com, heikki.krogerus@...ux.intel.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        rafael.j.wysocki@...el.com, rdunlap@...radead.org,
        rydberg@...math.org, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in evdev_cleanup

On Sun, May 24, 2020 at 01:22:44PM +0200, Greg KH wrote:
> On Sun, May 24, 2020 at 03:24:12AM -0700, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following crash on:
> > 
> > HEAD commit:    c11d28ab Add linux-next specific files for 20200522
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14f54441100000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=3f6dbdea4159fb66
> > dashboard link: https://syzkaller.appspot.com/bug?extid=20458a5eab138777efc9
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=133e254a100000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15dbf016100000
> > 
> > The bug was bisected to:
> > 
> > commit 4ef12f7198023c09ad6d25b652bd8748c965c7fa
> > Author: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> > Date:   Wed May 13 15:18:40 2020 +0000
> > 
> >     kobject: Make sure the parent does not get released before its children
> 
> All issues that point to this commit can be now marked invalid as it has
> been reverted in Linus's tree.
> 

This is the way to invalidate a syzbot bug report:

#syz invalid