2 files changed, 4 insertions(+), 3 deletions(-)

M ip/ipaux.c
M ip/udp.c

@@ 260,8 260,10 @@ v4tov6(uchar *v6, uchar *v4)
 int
 v6tov4(uchar *v4, uchar *v6)
 {
-	if(memcmp(v6, v4prefix, IPv4off) != 0)
+	if(memcmp(v6, v4prefix, IPv4off) != 0){
+		memset(v4, 0, 4);
 		return -1;
+	}
 	memmove(v4, v6 + IPv4off, IPv4addrlen);
 	return 0;
 }

@@ 215,8 215,7 @@ udpkick(Conv *c, int)
 		hnputs(uh->udpdport, c->rport);
 		if(ipcmp(c->laddr, IPnoaddr) == 0)
 			findlocalip(f, c->laddr, c->raddr);
-		if(v6tov4(uh->udpsrc, c->laddr) < 0)
-			memset(uh->udpsrc, 0, sizeof(uh->udpsrc));
+		v6tov4(uh->udpsrc, c->laddr);
 		break;
 	}
 	hnputs(uh->udpsport, c->lport);