Fix a variety of memory leaks

This patch addresses a number of memory leaks in a variety of modules that were
found by a static analysis tool.  A brief summary of the changes:

* app_minivm:       free ast_str objects on off nominal paths
* app_page:         free the ast_dial object if the requested channel technology
                    cannot be appended to the dialing structure
* app_queue:        if a penalty rule failed to match any existing rule list
                    names, the created rule would not be inserted and its memory
                    would be leaked
* app_read:         dispose of the created silence detector in the presence of
                    off nominal circumstances
* app_voicemail:    dispose of an allocated unique ID field for MWI event
                    un-subscribe requests in off nominal paths; dispose of
                    configuration objects when using the secret.conf option
* chan_dahdi:       dispose of the allocated frame produced by ast_dsp_process
* chan_iax2:        properly unref peer in CLI command "iax2 unregister"
* chan_sip:         dispose of the allocated frame produced by sip_rtp_read's
                    call of ast_dsp_process; free memory in parse unit tests
* func_dialgroup:   properly deref ao2 object grhead in nominal path of
                    dialgroup_read
* func_odbc:        free resultset in off nominal paths of odbc_read
* cli:              free match_list in off nominal paths of CLI match completion
* config:           free comment_buffer/list_buffer when configuration file load
                    is unchanged; free the same buffers any time they were
                    created and config files were processed
* data:             free XML nodes in various places
* enum:             free context buffer in off nominal paths
* features:         free ast_call_feature in off nominal paths of applicationmap
                    config processing
* netsock2:         users of ast_sockaddr_resolve pass in an ast_sockaddr struct
                    that is allocated by the method.  Failures in
                    ast_sockaddr_resolve could result in the users of the method
                    not knowing whether or not the buffer was allocated.  The
                    method will now not allocate the ast_sockaddr struct if it
                    will return failure.
* pbx:              cleanup hash table traversals in off nominal paths; free
                    ignore pattern buffer if it already exists for the specified
                    context
* xmldoc:           cleanup various nodes when we no longer need them
* main/editline:    various cleanup of pointers not being freed before being
                    assigned to other memory, cleanup along off nominal paths
* menuselect/mxml:  cleanup of value buffer for an attribute when that attribute
                    did not specify a value
* res_calendar*:    responses are allocated via the various *_request method
                    returns and should not be allocated in the various
                    write_event methods; ensure attendee buffer is freed if no
                    data exists in the parsed node; ensure that calendar objects
                    are de-ref'd appropriately
* res_jabber:       free buffer in off nominal path
* res_musiconhold:  close the DIR* object in off nominal paths
* res_rtp_asterisk: if we run out of ports, close the rtp socket object and free
                    the rtp object
* res_srtp:         if we fail to create the session in libsrtp, destroy the
                    temporary ast_srtp object

(issue ASTERISK-19665)
Reported by: Matt Jordan

Review: https://reviewboard.asterisk.org/r/1922
........

Merged revisions 366880 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 366881 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@366917 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 31 insertions, 16 deletions

diff --git a/apps/app_voicemail.c b/apps/app_voicemail.c
index 7e75ea9a9..eec08a484 100644
--- a/apps/app_voicemail.c
+++ b/apps/app_voicemail.c
@@ -11728,16 +11728,22 @@ static int handle_subscribe(void *datap)
 static void mwi_unsub_event_cb(const struct ast_event *event, void *userdata)
 {
 	uint32_t u, *uniqueid = ast_calloc(1, sizeof(*uniqueid));
-	if (ast_event_get_type(event) != AST_EVENT_UNSUB)
+
+	if (!uniqueid) {
+		ast_log(LOG_ERROR, "Unable to allocate memory for uniqueid\n");
 		return;
+	}
 
-	if (ast_event_get_ie_uint(event, AST_EVENT_IE_EVENTTYPE) != AST_EVENT_MWI)
+	if (ast_event_get_type(event) != AST_EVENT_UNSUB) {
+		ast_free(uniqueid);
 		return;
+	}
 
-	if (!uniqueid) {
-		ast_log(LOG_ERROR, "Unable to allocate memory for uniqueid\n");
+	if (ast_event_get_ie_uint(event, AST_EVENT_IE_EVENTTYPE) != AST_EVENT_MWI) {
+		ast_free(uniqueid);
 		return;
 	}
+
 	u = ast_event_get_ie_uint(event, AST_EVENT_IE_UNIQUEID);
 	*uniqueid = u;
 	if (ast_taskprocessor_push(mwi_subscription_tps, handle_unsubscribe, uniqueid) < 0) {
@@ -12728,8 +12734,10 @@ static void read_password_from_file(const char *secretfn, char *password, int pa
 		const char *val = ast_variable_retrieve(pwconf, "general", "password");
 		if (val) {
 			ast_copy_string(password, val, passwordlen);
- 			return;
+			ast_config_destroy(pwconf);
+			return;
 		}
+		ast_config_destroy(pwconf);
 	}
 	ast_log(LOG_NOTICE, "Failed reading voicemail password from %s, using secret from config file\n", secretfn);
 }
@@ -12738,26 +12746,33 @@ static int write_password_to_file(const char *secretfn, const char *password) {
 	struct ast_config *conf;
 	struct ast_category *cat;
 	struct ast_variable *var;
+	int res = -1;
 
-	if (!(conf=ast_config_new())) {
+	if (!(conf = ast_config_new())) {
 		ast_log(LOG_ERROR, "Error creating new config structure\n");
-		return -1;
+		return res;
 	}
-	if (!(cat=ast_category_new("general","",1))) {
+	if (!(cat = ast_category_new("general", "", 1))) {
 		ast_log(LOG_ERROR, "Error creating new category structure\n");
-		return -1;
+		ast_config_destroy(conf);
+		return res;
 	}
-	if (!(var=ast_variable_new("password",password,""))) {
+	if (!(var = ast_variable_new("password", password, ""))) {
 		ast_log(LOG_ERROR, "Error creating new variable structure\n");
-		return -1;
+		ast_config_destroy(conf);
+		ast_category_destroy(cat);
+		return res;
 	}
-	ast_category_append(conf,cat);
-	ast_variable_append(cat,var);
-	if (ast_config_text_file_save(secretfn, conf, "app_voicemail")) {
+	ast_category_append(conf, cat);
+	ast_variable_append(cat, var);
+	if (!ast_config_text_file_save(secretfn, conf, "app_voicemail")) {
+		res = 0;
+	} else {
 		ast_log(LOG_ERROR, "Error writing voicemail password to %s\n", secretfn);
-		return -1;
 	}
-	return 0;
+
+	ast_config_destroy(conf);
+	return res;
 }
 
 static int vmsayname_exec(struct ast_channel *chan, const char *data)