netdev - [PATCH net 2/5] mptcp: strict validation before using mp

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Message-ID: <20240111194917.4044654-3-edumazet@google.com>
Date: Thu, 11 Jan 2024 19:49:14 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Matthieu Baerts <matttbe@...nel.org>, Mat Martineau <martineau@...nel.org>, 
	Geliang Tang <geliang.tang@...ux.dev>, Florian Westphal <fw@...len.de>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>, 
	Peter Krystad <peter.krystad@...ux.intel.com>
Subject: [PATCH net 2/5] mptcp: strict validation before using mp_opt->hmac

mp_opt->hmac contains uninitialized data unless OPTION_MPTCP_MPJ_ACK
was set in mptcp_parse_option().

We must refine the condition before we call subflow_hmac_valid().

Fixes: f296234c98a8 ("mptcp: Add handling of incoming MP_JOIN requests")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Florian Westphal <fw@...len.de>
Cc: Peter Krystad <peter.krystad@...ux.intel.com>
Cc: Matthieu Baerts <matttbe@...nel.org>
Cc: Mat Martineau <martineau@...nel.org>
Cc: Geliang Tang <geliang.tang@...ux.dev>
---
 net/mptcp/subflow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 3eacd04e7099e6de1a161c176a74959722445286..bb05477006a6ea111b7fc79645099dfa924e4135 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -788,7 +788,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
 
 	} else if (subflow_req->mp_join) {
 		mptcp_get_options(skb, &mp_opt);
-		if (!(mp_opt.suboptions & OPTIONS_MPTCP_MPJ) ||
+		if (!(mp_opt.suboptions & OPTION_MPTCP_MPJ_ACK) ||
 		    !subflow_hmac_valid(req, &mp_opt) ||
 		    !mptcp_can_accept_new_subflow(subflow_req->msk)) {
 			SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINACKMAC);
-- 
2.43.0.275.g3460e3d667-goog