netdev - Re: [PATCH net-next 4/8] ipv6: use RCU in ip6

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Message-ID: <197f245e-a5cf-485c-a3d1-bafc8dc00137@kernel.org>
Date: Thu, 28 Aug 2025 16:01:26 -0600
From: David Ahern <dsahern@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Neal Cardwell <ncardwell@...gle.com>
Cc: Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>,
 netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next 4/8] ipv6: use RCU in ip6_output()

On 8/28/25 1:58 PM, Eric Dumazet wrote:
> Use RCU in ip6_output() in order to use dst_dev_rcu() to prevent
> possible UAF.
> 
> We can remove rcu_read_lock()/rcu_read_unlock() pairs
> from ip6_finish_output2().
> 
> Fixes: 4a6ce2b6f2ec ("net: introduce a new function dst_dev_put()")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  net/ipv6/ip6_output.c | 29 +++++++++++++++--------------
>  1 file changed, 15 insertions(+), 14 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>