linux-kernel - Re: [PATCH net] l2tp: account for IP version in SKB headroom

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <aTcH2UjqAvd84l59@horms.kernel.org>
Date: Mon, 8 Dec 2025 17:16:09 +0000
From: Simon Horman <horms@...nel.org>
To: David Bauer <mail@...id-bauer.net>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	"R. Parameswaran" <parameswaran.r7@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] l2tp: account for IP version in SKB headroom

On Sat, Dec 06, 2025 at 05:26:01PM +0100, David Bauer wrote:
> Account for the IP version of the tunnel when accounting skb headroom on
> xmit. This avoids having to potentially copy the skb a second time down
> the stack due to allocating not enough space for IPv6 headers in case
> the tunnel uses IPv6.
> 
> Fixes: b784e7ebfce8 ("L2TP:Adjust intf MTU, add underlay L3, L2 hdrs.")
> Signed-off-by: David Bauer <mail@...id-bauer.net>

Hi David,

This feels more like an enhancement for net-next than a fix for net.

If so, please resubmit for net-next once it reopens, after 2nd January.

In that case the fixes tag should be dropped.
But you can cite a commit in free-form text in the commit message -
above the tags - something like this.

...

Introduced by commit b784e7ebfce8 ("L2TP:Adjust intf MTU, add underlay L3,
L2 hdrs.").

Signed-off-by: ...