Audit ast_sockaddr_resolve() usage for memory leaks.

Valgrind found some memory leaks associated with ast_sockaddr_resolve().
Most of the leaks had already been fixed by earlier memory leak hunt
patches.  This patch performs an audit of ast_sockaddr_resolve() and found
one more.

* Fix ast_sockaddr_resolve() memory leak in
apps/app_externalivr.c:app_exec().

* Made main/netsock2.c:ast_sockaddr_resolve() always set the addrs
parameter for safety so the pointer will never be uninitialized on return.
The same goes for res/res_pjsip_acl.c:extract_contact_addr().

* Made functions that call ast_sockaddr_resolve() with RAII_VAR()
controlling the addrs variable use ast_free instead of ast_free_ptr to
provide better MALLOC_DEBUG information.

Review: https://reviewboard.asterisk.org/r/4509/
........

Merged revisions 433056 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@433057 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_externalivr.c

@@ -519,6 +519,8 @@ static int app_exec(struct ast_channel *chan, const char *data)
 			break;
 		}
 
+		ast_free(addrs);
+
 		if (i == num_addrs) {
 			ast_chan_log(LOG_ERROR, chan, "Could not connect to any host.  ExternalIVR failed.\n");
 			goto exit;

main/netsock2.c

@@ -287,11 +287,13 @@ int ast_sockaddr_resolve(struct ast_sockaddr **addrs, const char *str,
 	int	e, i, res_cnt;
 
 	if (!str) {
+		*addrs = NULL;
 		return 0;
 	}
 
 	s = ast_strdupa(str);
 	if (!ast_sockaddr_split_hostport(s, &host, &port, flags)) {
+		*addrs = NULL;
 		return 0;
 	}
 
@@ -302,6 +304,7 @@ int ast_sockaddr_resolve(struct ast_sockaddr **addrs, const char *str,
 	if ((e = getaddrinfo(host, port, &hints, &res))) {
 		ast_log(LOG_ERROR, "getaddrinfo(\"%s\", \"%s\", ...): %s\n",
 			host, S_OR(port, "(null)"), gai_strerror(e));
+		*addrs = NULL;
 		return 0;
 	}
 
@@ -311,6 +314,7 @@ int ast_sockaddr_resolve(struct ast_sockaddr **addrs, const char *str,
 	}
 
 	if (res_cnt == 0) {
+		*addrs = NULL;
 		goto cleanup;
 	}
 

res/res_pjsip_acl.c

@@ -139,9 +139,11 @@ static int extract_contact_addr(pjsip_contact_hdr *contact, struct ast_sockaddr
 	char host[256];
 
 	if (!contact || contact->star) {
+		*addrs = NULL;
 		return 0;
 	}
 	if (!PJSIP_URI_SCHEME_IS_SIP(contact->uri) && !PJSIP_URI_SCHEME_IS_SIPS(contact->uri)) {
+		*addrs = NULL;
 		return 0;
 	}
 	sip_uri = pjsip_uri_get_uri(contact->uri);

res/res_pjsip_sdp_rtp.c

@@ -758,7 +758,7 @@ static int negotiate_incoming_sdp_stream(struct ast_sip_session *session, struct
 					 const struct pjmedia_sdp_session *sdp, const struct pjmedia_sdp_media *stream)
 {
 	char host[NI_MAXHOST];
-	RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free_ptr);
+	RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
 	enum ast_media_type media_type = stream_to_media_type(session_media->stream_type);
 	enum ast_sip_session_media_encryption encryption = AST_SIP_MEDIA_ENCRYPT_NONE;
 	int res;
@@ -1115,7 +1115,7 @@ static int apply_negotiated_sdp_stream(struct ast_sip_session *session, struct a
 				       const struct pjmedia_sdp_session *local, const struct pjmedia_sdp_media *local_stream,
 				       const struct pjmedia_sdp_session *remote, const struct pjmedia_sdp_media *remote_stream)
 {
-	RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free_ptr);
+	RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
 	enum ast_media_type media_type = stream_to_media_type(session_media->stream_type);
 	char host[NI_MAXHOST];
 	int fdno, res;

res/res_pjsip_t38.c

@@ -619,7 +619,7 @@ static int negotiate_incoming_sdp_stream(struct ast_sip_session *session, struct
 {
 	struct t38_state *state;
 	char host[NI_MAXHOST];
-	RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free_ptr);
+	RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
 
 	if (!session->endpoint->media.t38.enabled) {
 		return -1;
@@ -762,7 +762,7 @@ static int apply_negotiated_sdp_stream(struct ast_sip_session *session, struct a
 				       const struct pjmedia_sdp_session *local, const struct pjmedia_sdp_media *local_stream,
 				       const struct pjmedia_sdp_session *remote, const struct pjmedia_sdp_media *remote_stream)
 {
-	RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free_ptr);
+	RAII_VAR(struct ast_sockaddr *, addrs, NULL, ast_free);
 	char host[NI_MAXHOST];
 	struct t38_state *state;