netdev - Re: [PATCH] xfrm: Silence warnings triggerable by bad packets

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Date: Tue, 11 Jul 2023 11:04:05 +0200
From: Steffen Klassert <steffen.klassert@...unet.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
CC: Maciej Żenczykowski <maze@...gle.com>, Maciej
 Żenczykowski <zenczykowski@...il.com>, "Linux Network
 Development Mailing List" <netdev@...r.kernel.org>, Benedict Wong
	<benedictwong@...gle.com>, Lorenzo Colitti <lorenzo@...gle.com>, Yan Yan
	<evitayan@...gle.com>
Subject: Re: [PATCH] xfrm: Silence warnings triggerable by bad packets

On Tue, Jul 04, 2023 at 08:53:49AM +0800, Herbert Xu wrote:
> On Fri, Jun 30, 2023 at 08:37:58AM -0700, Maciej Żenczykowski wrote:
> > Steffan, this isn't of course a patch meant for inclusion, instead just a WARN_ON hit report.
> > The patch is simply what prints the following extra info:
> > 
> > xfrm_prepare_input: XFRM_MODE_SKB_CB(skb)->protocol: 17
> > xfrm_inner_mode_encap_remove: x->props.mode: 1 XFRM_MODE_SKB_SB(skb)->protocol:17
> > 
> > (note: XFRM_MODE_TUNNEL=1 IPPROTO_UDP=17)
> 
> Thanks for the report.  This patch should fix the warnings:
> 
> ---8<---
> After the elimination of inner modes, a couple of warnings that
> were previously unreachable can now be triggered by malformed
> inbound packets.
> 
> Fix this by:
> 
> 1. Moving the setting of skb->protocol into the decap functions.
> 2. Returning -EINVAL when unexpected protocol is seen.
> 
> Reported-by: Maciej Żenczykowski<maze@...gle.com>
> Fixes: 5f24f41e8ea6 ("xfrm: Remove inner/outer modes from input path")
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied, thanks a lot Herbert!