netdev - Re: [PATCH net] ipv6: ensure sane device mtu in tunnels

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Date:   Tue, 25 Oct 2022 23:10:16 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, edumazet@...gle.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] ipv6: ensure sane device mtu in tunnels

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Sun, 23 Oct 2022 19:01:24 -0700 you wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> Another syzbot report [1] with no reproducer hints
> at a bug in ip6_gre tunnel (dev:ip6gretap0)
> 
> Since ipv6 mcast code makes sure to read dev->mtu once
> and applies a sanity check on it (see commit b9b312a7a451
> "ipv6: mcast: better catch silly mtu values"), a remaining
> possibility is that a layer is able to set dev->mtu to
> an underflowed value (high order bit set).
> 
> [...]

Here is the summary with links:
  - [net] ipv6: ensure sane device mtu in tunnels
    https://git.kernel.org/netdev/net/c/d89d7ff01235

You are awesome, thank you!
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