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net: mctp: Set SOCK_RCU_FREE

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[ Upstream commit 52024cd6ec71a6ca934d0cc12452bd8d49850679 ]

Bind lookup runs under RCU, so ensure that a socket doesn't go away in
the middle of a lookup.

Fixes: 833ef3b91d ("mctp: Populate socket implementation")
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Link: https://patch.msgid.link/20250410-mctp-rcu-sock-v1-1-872de9fdc877@codeconstruct.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matt Johnston
2025-04-10 11:53:19 +08:00
committed by Greg Kroah-Hartman
parent 9027e07356
commit a8a3b61ce1
1 changed files with 3 additions and 0 deletions
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3
net/mctp/af_mctp.c
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@@ -550,6 +550,9 @@ 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);