X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/5f86b177eb3f358d0813646102e3da720b809771..89e97516fedf1d0a7fe9c569bb569fa7ea872afa:/unix/uxnet.c

diff --git a/unix/uxnet.c b/unix/uxnet.c
index 8865d9d5..2b3d8cbc 100644
--- a/unix/uxnet.c
+++ b/unix/uxnet.c
@@ -236,7 +236,7 @@ SockAddr sk_nonamelookup(const char *host)
 static int sk_nextaddr(SockAddr addr)
 {
 #ifndef NO_IPV6
-    if (addr->ai->ai_next) {
+    if (addr->ai && addr->ai->ai_next) {
 	addr->ai = addr->ai->ai_next;
 	addr->family = addr->ai->ai_family;
 	return TRUE;
@@ -470,6 +470,8 @@ static int try_connect(Actual_Socket sock)
 	goto ret;
     }
 
+    fcntl(s, F_SETFD, FD_CLOEXEC);
+
     if (sock->oobinline) {
 	int b = TRUE;
 	setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
@@ -691,7 +693,10 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, i
      * into local reality.
      */
     address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
-		      address_family == ADDRTYPE_IPV6 ? AF_INET6 : AF_UNSPEC);
+#ifndef NO_IPV6
+		      address_family == ADDRTYPE_IPV6 ? AF_INET6 :
+#endif
+		      AF_UNSPEC);
 
 #ifndef NO_IPV6
     /* Let's default to IPv6.
@@ -707,17 +712,21 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, i
      */
     s = socket(address_family, SOCK_STREAM, 0);
 
+#ifndef NO_IPV6
     /* If the host doesn't support IPv6 try fallback to IPv4. */
     if (s < 0 && address_family == AF_INET6) {
     	address_family = AF_INET;
     	s = socket(address_family, SOCK_STREAM, 0);
     }
+#endif
 
     if (s < 0) {
 	ret->error = strerror(errno);
 	return (Socket) ret;
     }
 
+    fcntl(s, F_SETFD, FD_CLOEXEC);
+
     ret->oobinline = 0;
 
     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
@@ -1277,9 +1286,10 @@ SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname)
     else
 	*canonicalname = dupstr(ret->hostname);
 #ifndef NO_IPV6
-    ret->ais = NULL;
+    ret->ai = ret->ais = NULL;
 #else
     ret->addresses = NULL;
+    ret->curraddr = ret->naddresses = 0;
 #endif
     return ret;
 }