netdev - Re: KASAN: slab-out-of-bounds Read in bitmap_ip_ext

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Message-ID: <20200120174615.GE21151@kadam>
Date:   Mon, 20 Jan 2020 20:46:15 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     syzbot <syzbot+6491ea8f6dddbf04930e@...kaller.appspotmail.com>,
        a@...table.cc, akpm@...ux-foundation.org, allison@...utok.net,
        arnd@...db.de, axboe@...nel.dk, b.a.t.m.a.n@...ts.open-mesh.org,
        bp@...en8.de, catalin.marinas@....com, chris@...kel.net,
        christian@...uner.io, coreteam@...filter.org, davem@...emloft.net,
        elena.reshetova@...el.com, florent.fourcot@...irst.fr,
        fw@...len.de, geert@...ux-m68k.org, hare@...e.com,
        heiko.carstens@...ibm.com, hpa@...or.com, info@...ux.net,
        jcmvbkbc@...il.com, jeremy@...zel.net, johannes.berg@...el.com,
        kadlec@...filter.org, linux-api@...r.kernel.org,
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        linux-xtensa@...ux-xtensa.org, linux@...linux.org.uk,
        mareklindner@...mailbox.ch, mingo@...hat.com,
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        pablo@...filter.org, peterz@...radead.org, sw@...onwunderlich.de,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        viro@...iv.linux.org.uk, will@...nel.org, x86@...nel.org
Subject: Re: KASAN: slab-out-of-bounds Read in bitmap_ip_ext_cleanup

On Mon, Jan 20, 2020 at 02:19:31PM +0100, Christian Brauner wrote:
> On Sun, Jan 19, 2020 at 05:35:01PM -0800, syzbot wrote:
> > syzbot has bisected this bug to:
> > 
> > commit d68dbb0c9ac8b1ff52eb09aa58ce6358400fa939
> > Author: Christian Brauner <christian@...uner.io>
> > Date:   Thu Jun 20 23:26:35 2019 +0000
> > 
> >     arch: handle arches who do not yet define clone3
> > 
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1456fed1e00000
> > start commit:   09d4f10a net: sched: act_ctinfo: fix memory leak
> > git tree:       net
> > final crash:    https://syzkaller.appspot.com/x/report.txt?x=1656fed1e00000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1256fed1e00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=7e89bd00623fe71e
> > dashboard link: https://syzkaller.appspot.com/bug?extid=6491ea8f6dddbf04930e
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=141af959e00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1067fa85e00000
> > 
> > Reported-by: syzbot+6491ea8f6dddbf04930e@...kaller.appspotmail.com
> > Fixes: d68dbb0c9ac8 ("arch: handle arches who do not yet define clone3")
> > 
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> 
> This bisect seems bogus.
> 

Yeah.  József Kadlecsik already fixed the bug in a different thread.  It
was reported as seven different bugs so there was a bunch of threads for
it.

regards,
dan carpenter