netdev - Re: [PATCH net 7/8] ndisc: extend RCU protection in ndisc_send

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Message-ID: <20250210012931.56257-1-kuniyu@amazon.com>
Date: Mon, 10 Feb 2025 10:29:31 +0900
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <edumazet@...gle.com>
CC: <davem@...emloft.net>, <dsahern@...nel.org>, <eric.dumazet@...il.com>,
	<horms@...nel.org>, <kuba@...nel.org>, <kuniyu@...zon.com>,
	<netdev@...r.kernel.org>, <pabeni@...hat.com>
Subject: Re: [PATCH net 7/8] ndisc: extend RCU protection in ndisc_send_skb()

From: Eric Dumazet <edumazet@...gle.com>
Date: Fri,  7 Feb 2025 13:58:39 +0000
> ndisc_send_skb() can be called without RTNL or RCU held.
> 
> Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu()
> and avoid a potential UAF.
> 
> Fixes: 1762f7e88eb3 ("[NETNS][IPV6] ndisc - make socket control per namespace")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@...zon.com>