netdev - Re: [PATCH net 4/8] arp: use RCU protection in arp

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Message-ID: <683a3bde-cf11-4265-a73e-d3c40abdf4fb@kernel.org>
Date: Fri, 7 Feb 2025 13:43:51 -0700
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>
Cc: netdev@...r.kernel.org, Kuniyuki Iwashima <kuniyu@...zon.com>,
 Simon Horman <horms@...nel.org>, eric.dumazet@...il.com
Subject: Re: [PATCH net 4/8] arp: use RCU protection in arp_xmit()

On 2/7/25 6:58 AM, Eric Dumazet wrote:
> arp_xmit() can be called without RTNL or RCU protection.
> 
> Use RCU protection to avoid potential UAF.
> 
> Fixes: 29a26a568038 ("netfilter: Pass struct net into the netfilter hooks")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  net/ipv4/arp.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 

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