netdev - Re: [PATCH net] ipv6/addrconf: fix potential NULL deref in inet6_set_link

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Message-Id: <20200207.103605.2059545131045029032.davem@davemloft.net>
Date:   Fri, 07 Feb 2020 10:36:05 +0100 (CET)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        syzkaller@...glegroups.com, maximmi@...lanox.com
Subject: Re: [PATCH net] ipv6/addrconf: fix potential NULL deref in
 inet6_set_link_af()

From: Eric Dumazet <edumazet@...gle.com>
Date: Thu, 6 Feb 2020 18:50:40 -0800

> If I understood the repro well enough, it seems it sets the device MTU
> to 1023, thus IPV6 is automatically disabled. (as mtu < 1280)

Now I understand.

Can you add some text about this to the commit message?  Just saying
that if the request also lowers the mtu below the ipv6 min mtu then we
will see the NULL idev.

Thanks.