Release host name memory. Fixes #783312. Will backport to 2.3.

Modules/socketmodule.c

@@ -956,7 +956,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
 	{
 		struct sockaddr_in* addr;
 		char *host;
-		int port;
+		int port, result;
  		addr=(struct sockaddr_in*)&(s->sock_addr).in;
 		if (!PyTuple_Check(args)) {
 			PyErr_Format(
@@ -969,7 +969,10 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
 		if (!PyArg_ParseTuple(args, "eti:getsockaddrarg", 
 				      "idna", &host, &port))
 			return 0;
-		if (setipaddr(host, (struct sockaddr *)addr, sizeof(*addr),  AF_INET) < 0)
+                result = setipaddr(host, (struct sockaddr *)addr, 
+                                   sizeof(*addr),  AF_INET);
+                PyMem_Free(host);
+                if (result < 0)
 			return 0;
 		addr->sin_family = AF_INET;
 		addr->sin_port = htons((short)port);
@@ -983,7 +986,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
 	{
 		struct sockaddr_in6* addr;
 		char *host;
-		int port, flowinfo, scope_id;
+		int port, flowinfo, scope_id, result;
  		addr = (struct sockaddr_in6*)&(s->sock_addr).in6;
 		flowinfo = scope_id = 0;
 		if (!PyArg_ParseTuple(args, "eti|ii", 
@@ -991,7 +994,10 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
 				      &scope_id)) {
 			return 0;
 		}
-		if (setipaddr(host, (struct sockaddr *)addr,  sizeof(*addr), AF_INET6) < 0)
+                result = setipaddr(host, (struct sockaddr *)addr,  
+                                   sizeof(*addr), AF_INET6);
+                PyMem_Free(host);
+                if (result < 0)
 			return 0;
 		addr->sin6_family = s->sock_family;
 		addr->sin6_port = htons((short)port);
@@ -3100,7 +3106,7 @@ socket_getaddrinfo(PyObject *self, PyObject *args)
 		pptr = (char *)NULL;
 	} else {
 		PyErr_SetString(socket_error, "Int or String expected");
-		return NULL;
+                goto err;
 	}
 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = family;
@@ -3114,7 +3120,7 @@ socket_getaddrinfo(PyObject *self, PyObject *args)
 	RELEASE_GETADDRINFO_LOCK  /* see comment in setipaddr() */
 	if (error) {
 		set_gaierror(error);
-		return NULL;
+		goto err;
 	}
 
 	if ((all = PyList_New(0)) == NULL)