linux-kernel - Re: [PATCH v5.10-v5.15 ] ipv6: use RCU in ip6

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Message-ID: <2026020822-stable-slogan-8452@gregkh>
Date: Sun, 8 Feb 2026 16:00:45 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Keerthana K <keerthana.kalyanasundaram@...adcom.com>
Cc: stable@...r.kernel.org, davem@...emloft.net, yoshfuji@...ux-ipv6.org,
	dsahern@...nel.org, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, kafai@...com, weiwan@...gle.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ajay.kaher@...adcom.com, alexey.makhalov@...adcom.com,
	vamsi-krishna.brahmajosyula@...adcom.com, yin.ding@...adcom.com,
	tapas.kundu@...adcom.com, Sasha Levin <sashal@...nel.org>,
	Shivani Agarwal <shivani.agarwal@...adcom.com>
Subject: Re: [PATCH v5.10-v5.15 ] ipv6: use RCU in ip6_xmit()

On Thu, Feb 05, 2026 at 07:46:44AM +0000, Keerthana K wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> [ Upstream commit 9085e56501d93af9f2d7bd16f7fcfacdde47b99c ]
> 
> Use RCU in ip6_xmit() in order to use dst_dev_rcu() to prevent
> possible UAF.
> 
> Fixes: 4a6ce2b6f2ec ("net: introduce a new function dst_dev_put()")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reviewed-by: David Ahern <dsahern@...nel.org>
> Link: https://patch.msgid.link/20250828195823.3958522-4-edumazet@google.com
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> Signed-off-by: Keerthana K <keerthana.kalyanasundaram@...adcom.com>
> Signed-off-by: Shivani Agarwal <shivani.agarwal@...adcom.com>
> ---
>  net/ipv6/ip6_output.c | 35 +++++++++++++++++++++--------------
>  1 file changed, 21 insertions(+), 14 deletions(-)

We need working versions for newer kernels first.  Please resend this
when you have submitted patches for the newer releases.

thanks,

greg k-h