netdev - Re: [PATCH net] icmp: guard against too small mtu

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Date:   Sat, 01 Apr 2023 04:40:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        dsahern@...nel.org, netdev@...r.kernel.org, eric.dumazet@...il.com,
        syzbot+d373d60fddbdc915e666@...kaller.appspotmail.com
Subject: Re: [PATCH net] icmp: guard against too small mtu

Hello:

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

On Thu, 30 Mar 2023 17:45:02 +0000 you wrote:
> syzbot was able to trigger a panic [1] in icmp_glue_bits(), or
> more exactly in skb_copy_and_csum_bits()
> 
> There is no repro yet, but I think the issue is that syzbot
> manages to lower device mtu to a small value, fooling __icmp_send()
> 
> __icmp_send() must make sure there is enough room for the
> packet to include at least the headers.
> 
> [...]

Here is the summary with links:
  - [net] icmp: guard against too small mtu
    https://git.kernel.org/netdev/net/c/7d63b6712538

You are awesome, thank you!
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