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

[Eric Dumazet]

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)

Thanks.