mptcp: strict validation before using mp_opt->hmac

[ Upstream commit c1665273bdc7c201766c65e561c06711f2e050dc ]

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@google.com>
Cc: Florian Westphal <fw@strlen.de>
Cc: Peter Krystad <peter.krystad@linux.intel.com>
Cc: Matthieu Baerts <matttbe@kernel.org>
Cc: Mat Martineau <martineau@kernel.org>
Cc: Geliang Tang <geliang.tang@linux.dev>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20240111194917.4044654-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 45b8115..d6ee0e5 100644 (file)
--- 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);