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>

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index cd15ec7..c539140 100644 (file)
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -108,6 +108,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
                        mp_opt->suboptions |= OPTION_MPTCP_DSS;
                        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;
                }