From: Phillip Potter <phil@philpotter.co.uk>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: davem@davemloft.net, yoshfuji@linux-ipv6.org, dsahern@kernel.org,
kuba@kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: initialize local variables in net/ipv6/mcast.c and net/ipv4/igmp.c
Date: Sat, 3 Apr 2021 20:41:15 +0100 [thread overview]
Message-ID: <YGjE29JgJFQG/C97@equinox> (raw)
In-Reply-To: <05c984b6-140d-112e-9151-4aea6e8e5a80@gmail.com>
On Fri, Apr 02, 2021 at 11:12:36PM +0200, Eric Dumazet wrote:
>
>
> On 4/2/21 10:53 PM, Eric Dumazet wrote:
> >
> >
> > On 4/2/21 8:10 PM, Phillip Potter wrote:
> >> On Fri, Apr 02, 2021 at 07:49:44PM +0200, Eric Dumazet wrote:
> >>>
> >>>
> >>> On 4/2/21 7:36 PM, Phillip Potter wrote:
> >>>> Use memset to initialize two local buffers in net/ipv6/mcast.c,
> >>>> and another in net/ipv4/igmp.c. Fixes a KMSAN found uninit-value
> >>>> bug reported by syzbot at:
> >>>> https://syzkaller.appspot.com/bug?id=0766d38c656abeace60621896d705743aeefed51
> >>>
> >>>
> >>> According to this link, the bug no longer triggers.
> >>>
> >>> Please explain why you think it is still there.
> >>>
> >>
> >> Dear Eric,
> >>
> >> It definitely still triggers, tested it on the master branch of
> >> https://github.com/google/kmsan last night. The patch which fixes the
> >> crash on that page is the same patch I've sent in.
> >
> > Please send the full report (stack trace)
>
> I think your patch just silences the real problem.
>
> The issue at hand is that TUNSETLINK changes dev->type without making
> any change to dev->addr_len
>
> This is the real issue.
>
> If you care about this, please fix tun driver.
>
Dear Eric,
Thank you for pointing me in the right direction. I will do as you
suggest.
Regards,
Phil
prev parent reply other threads:[~2021-04-03 19:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-02 17:36 [PATCH] net: initialize local variables in net/ipv6/mcast.c and net/ipv4/igmp.c Phillip Potter
2021-04-02 17:49 ` Eric Dumazet
2021-04-02 18:10 ` Phillip Potter
2021-04-02 20:53 ` Eric Dumazet
2021-04-02 21:12 ` Eric Dumazet
2021-04-03 19:41 ` Phillip Potter [this message]
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