linux-kernel - Re: [PATCH] net: initialize local variables in net/ipv6/mcast.c and net/ipv4/igmp.c

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Message-ID: <YGdeAK3BwWSnDwRX@equinox>
Date:   Fri, 2 Apr 2021 19:10:08 +0100
From:   Phillip Potter <phil@...lpotter.co.uk>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: initialize local variables in net/ipv6/mcast.c and
 net/ipv4/igmp.c

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.

Regards,
Phil