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authorTao Wu <lepton@google.com>2017-11-08 14:53:40 -0800
committerSamuel Thibault <samuel.thibault@ens-lyon.org>2017-11-09 18:59:22 +0100
commit990132cda9baa27bdc558df6c9c15aacb0322d2c (patch)
treecb40a0540ad52feeb05d38f5cc2c705bd5cee6d4 /slirp
parentb0fbe46ad82982b289a44ee2495b59b0bad8a842 (diff)
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 <lepton@google.com> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Diffstat (limited to 'slirp')
-rw-r--r--slirp/tcp_subr.c11
1 files changed, 10 insertions, 1 deletions
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 {
/*