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

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Message-ID: <CANEJEGuhZChGXFzbwaEwArM4UKjUxZo=WNbREPH3887xtu62Nw@mail.gmail.com>
Date:   Tue, 31 Mar 2020 10:44:29 -0700
From:   Grant Grundler <grundler@...omium.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     syzbot <syzbot+a66a7c2e996797bb4acb@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>, festevam@...il.com,
        Grant Grundler <grundler@...omium.org>,
        Hayes Wang <hayeswang@...ltek.com>, johan.hedberg@...il.com,
        kernel@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
        linux-bluetooth@...r.kernel.org, linux-imx@....com,
        LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
        marcel@...tmann.org, nishadkamdar@...il.com, peter.chen@....com,
        Prashant Malani <pmalani@...omium.org>,
        Sascha Hauer <s.hauer@...gutronix.de>, shawnguo@...nel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in skb_release_data (2)

On Tue, Mar 31, 2020 at 10:41 AM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Tue, Mar 31, 2020 at 10:36:01AM -0700, syzbot wrote:
> > syzbot suspects this bug was fixed by commit:
> >
> > commit d9958306d4be14f4c7466242b38ed3893a7b1386
> > Author: Nishad Kamdar <nishadkamdar@...il.com>
> > Date:   Sun Mar 15 10:55:07 2020 +0000
> >
> >     USB: chipidea: Use the correct style for SPDX License Identifier
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16d4940be00000
> > start commit:   63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
> > git tree:       upstream
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
> > dashboard link: https://syzkaller.appspot.com/bug?extid=a66a7c2e996797bb4acb
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13c25a81e00000
> >
> > If the result looks correct, please mark the bug fixed by replying with:
> >
> > #syz fix: USB: chipidea: Use the correct style for SPDX License Identifier
>
> I really doubt a comment change fixed a syzbot bug :)

Just as I don't believe the bug was caused by pmalani's patch to r8152.

syzbot is just having trouble automatically bisecting/tracking this
bug since it appears only intermittently.

cheers,
grant