netdev - Re: [PATCH net] udp: Fix __ip_append_data()'s handling of MSG_SPLICE

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Date: Thu, 03 Aug 2023 02:30:21 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: David Howells <dhowells@...hat.com>
Cc: netdev@...r.kernel.org, willemdebruijn.kernel@...il.com,
 syzbot+f527b971b4bdc8e79f9e@...kaller.appspotmail.com, bpf@...r.kernel.org,
 brauner@...nel.org, davem@...emloft.net, dsahern@...nel.org,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, axboe@...nel.dk,
 viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
 syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] udp: Fix __ip_append_data()'s handling of
 MSG_SPLICE_PAGES

Hello:

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

On Tue, 01 Aug 2023 16:48:53 +0100 you wrote:
> __ip_append_data() can get into an infinite loop when asked to splice into
> a partially-built UDP message that has more than the frag-limit data and up
> to the MTU limit.  Something like:
> 
>         pipe(pfd);
>         sfd = socket(AF_INET, SOCK_DGRAM, 0);
>         connect(sfd, ...);
>         send(sfd, buffer, 8161, MSG_CONFIRM|MSG_MORE);
>         write(pfd[1], buffer, 8);
>         splice(pfd[0], 0, sfd, 0, 0x4ffe0ul, 0);
> 
> [...]

Here is the summary with links:
  - [net] udp: Fix __ip_append_data()'s handling of MSG_SPLICE_PAGES
    https://git.kernel.org/netdev/net/c/0f71c9caf267

You are awesome, thank you!
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