From dcda69668116b2bc30dd6e81400bb2a46a81b343 Mon Sep 17 00:00:00 2001
From: Edward Adam Davis <eadavis@qq.com>
Date: Thu, 23 Nov 2023 09:23:39 +0800
Subject: [PATCH] mptcp: fix uninit-value in mptcp_incoming_options

[ Upstream commit 237ff253f2d4f6307b7b20434d7cbcc67693298b ]

Added initialization use_ack to mptcp_parse_option().

Reported-by: syzbot+b834a6b2decad004cfa1@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/mptcp/options.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 64afe71e2..c389d7e47 100755
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -92,6 +92,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
 			mp_opt->dss = 1;
 			mp_opt->use_map = 1;
 			mp_opt->mpc_map = 1;
+			mp_opt->use_ack = 0;
 			mp_opt->data_len = get_unaligned_be16(ptr);
 			ptr += 2;
 		}