From 52024cd6ec71a6ca934d0cc12452bd8d49850679 Mon Sep 17 00:00:00 2001 From: Matt Johnston Date: Thu, 10 Apr 2025 11:53:19 +0800 Subject: [PATCH] net: mctp: Set SOCK_RCU_FREE Bind lookup runs under RCU, so ensure that a socket doesn't go away in the middle of a lookup. Fixes: 833ef3b91de6 ("mctp: Populate socket implementation") Signed-off-by: Matt Johnston Link: https://patch.msgid.link/20250410-mctp-rcu-sock-v1-1-872de9fdc877@codeconstruct.com.au Signed-off-by: Jakub Kicinski --- net/mctp/af_mctp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c index dd895617defd3..9b12ca97f4128 100644 --- a/net/mctp/af_mctp.c +++ b/net/mctp/af_mctp.c @@ -630,6 +630,9 @@ static int mctp_sk_hash(struct sock *sk) { struct net *net = sock_net(sk); + /* Bind lookup runs under RCU, remain live during that. */ + sock_set_flag(sk, SOCK_RCU_FREE); + mutex_lock(&net->mctp.bind_lock); sk_add_node_rcu(sk, &net->mctp.binds); mutex_unlock(&net->mctp.bind_lock); -- 2.39.5