From 990132cda9baa27bdc558df6c9c15aacb0322d2c Mon Sep 17 00:00:00 2001 From: Tao Wu Date: Wed, 8 Nov 2017 14:53:40 -0800 Subject: slirp: don't zero the whole ti_i when m == NULL 98c63057d2144fb81681580cd84c13c93794c96e ('slirp: Factorizing tcpiphdr structure with an union') introduced a memset call to clear possibly-undefined fields in ti. This however overwrites src/dst/pr which are used below. So let us clear only the unused fields. This should fix some rare cases (some RST cases, keep alive probes) where packets would be sent to 0.0.0.0. Signed-off-by: Tao Wu Signed-off-by: Samuel Thibault --- slirp/tcp_subr.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'slirp') diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c index dc8b4bbb50..da0d53743f 100644 --- a/slirp/tcp_subr.c +++ b/slirp/tcp_subr.c @@ -148,7 +148,16 @@ tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m, m->m_data += IF_MAXLINKHDR; *mtod(m, struct tcpiphdr *) = *ti; ti = mtod(m, struct tcpiphdr *); - memset(&ti->ti, 0, sizeof(ti->ti)); + switch (af) { + case AF_INET: + ti->ti.ti_i4.ih_x1 = 0; + break; + case AF_INET6: + ti->ti.ti_i6.ih_x1 = 0; + break; + default: + g_assert_not_reached(); + } flags = TH_ACK; } else { /* -- cgit v1.2.3