From: Oliver Neukum <oneukum@suse.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
steve_bayless@keysight.com,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
guido.kiener@rohde-schwarz.com,
syzbot <syzbot+55b0304b360654a7537b@syzkaller.appspotmail.com>,
USB list <linux-usb@vger.kernel.org>
Subject: Re: divide error in usbtmc_generic_read
Date: Mon, 19 Aug 2019 15:49:01 +0200 [thread overview]
Message-ID: <1566222541.5663.27.camel@suse.com> (raw)
In-Reply-To: <CAAeHK+wGzWGvW0AVSr6qA+AcpLr7A3Xi8wR7f-rBQJmMmQgU2A@mail.gmail.com>
Am Montag, den 19.08.2019, 15:18 +0200 schrieb Andrey Konovalov:
> On Mon, Aug 19, 2019 at 3:09 PM Oliver Neukum <oneukum@suse.com> wrote:
> >
> > Am Montag, den 19.08.2019, 14:43 +0200 schrieb Andrey Konovalov:
> > > On Mon, Aug 19, 2019 at 2:37 PM Oliver Neukum <oneukum@suse.com> wrote:
> > > > The original error was a divide by zero. The first fix fixed that
> > > > but still another error showed up. If I propose a fix there are
> > > > other possibilities besides it working.
> > > >
> > > > I could have no effect on the original bug or my fix breaks
> > > > something else and KASAN is making no difference between
> > > > those cases.
> > >
> > > I think you mean syzbot here and not KASAN. Do I understand correctly,
> > > that you're saying that the original report was
> >
> > Yes, sorry syzbot.
> >
> > > divide-by-zero, but
> > > when you requested to test the patch the reproducer triggered a
> > > use-after-free, and syzbot didn't treat the patch you provided as a
> > > correct fix?
> >
> > No, obviously there is still a bug. What I would like syzbot to have
> > would be a third category: inconclusive.
> > Seeing another bug instead may also mean the first bug struck
> > before the second could ever happen. We just lack data to tell.
>
> OK, I see. The exact words that syzbot uses in this case are "syzbot
> has tested the proposed patch but the reproducer still triggered
> crash". What would you like to see instead?
>
"syzbot has tested the proposed patch but the reproducer triggered
another crash" would make it clearer.
Regards
Oliver
next prev parent reply other threads:[~2019-08-19 13:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 11:38 divide error in usbtmc_generic_read syzbot
2019-08-14 13:25 ` Oliver Neukum
2019-08-14 13:38 ` syzbot
2019-08-14 13:52 ` Andrey Konovalov
2019-08-15 13:31 ` Oliver Neukum
2019-08-19 12:17 ` Andrey Konovalov
2019-08-19 12:37 ` Oliver Neukum
2019-08-19 12:43 ` Andrey Konovalov
2019-08-19 13:09 ` Oliver Neukum
2019-08-19 13:18 ` Andrey Konovalov
2019-08-19 13:49 ` Oliver Neukum [this message]
2019-08-19 15:40 ` Andrey Konovalov
2019-08-20 9:01 ` Oliver Neukum
2019-08-15 14:28 ` Oliver Neukum
2019-08-15 14:48 ` syzbot
2019-11-19 13:35 ` Andrey Konovalov
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