fixing coverity found defects - null dereference, break missing

(cherry picked from commit c004967)

Conflicts:
	db/db.c

db/db.c

@@ -263,18 +263,17 @@ int db_bind_mod(const str* mod, db_func_t* mydbf)
  */
 db_con_t* db_do_init(const str* url, void* (*new_connection)())
 {
-	struct db_id* id;
-	struct pool_con* con;
-	db_con_t* res;
-
-	int con_size = sizeof(db_con_t) + sizeof(void *) + url->len;
-	id = 0;
-	res = 0;
+	struct db_id *id = NULL;
+	struct pool_con *con = NULL;
+	db_con_t *res = NULL;
+	int con_size = 0;
 
 	if (!url || !url->s || !new_connection) {
 		LM_ERR("invalid parameter value\n");
 		return 0;
 	}
+
+	con_size = sizeof(db_con_t) + sizeof(void *) + url->len;
 	if (url->len > MAX_URL_LENGTH)
 	{
 		LM_ERR("SQL URL too long\n");

evi/event_interface.c

@@ -509,7 +509,7 @@ struct mi_root * mi_events_list(struct mi_root *cmd_tree, void *param)
 
 static int evi_print_subscriber(struct mi_node *rpl, evi_subs_p subs)
 {
-	evi_reply_sock *sock = subs->reply_sock;
+	evi_reply_sock *sock = subs != NULL ? subs->reply_sock : NULL;
 	struct mi_node *node = NULL;
 	str socket;
 

main.c

@@ -881,6 +881,7 @@ int main(int argc, char** argv)
 					break;
 			case 'R':
 					received_dns|=DO_REV_DNS;
+				    break;
 			case 'd':
 					(*debug)++;
 					break;

modules/alias_db/alookup.c

@@ -119,7 +119,7 @@ static int alias_db_query(struct sip_msg* _msg, char* _table,
 		goto err_server;
 	}
 
-	if (RES_ROW_N(db_res)<=0 || RES_ROWS(db_res)[0].values[0].nul != 0) {
+	if (db_res == NULL || RES_ROW_N(db_res)<=0 || RES_ROWS(db_res)[0].values[0].nul != 0) {
 		LM_DBG("no alias found for R-URI\n");
 		if (db_res!=NULL && adbf.free_result(db_handle, db_res) < 0)
 			LM_DBG("failed to freeing result of query\n");

modules/usrloc/dlist.c

@@ -195,7 +195,7 @@ static int get_all_db_ucontacts(void *buf, int len, unsigned int flags,
 				row = RES_ROWS(res) + i;
 				val = ROW_VALUES(row) + 3; /* cflags */
 				flag_list.s   = (char *)VAL_STRING(val);
-				flag_list.len = strlen(flag_list.s);
+				flag_list.len = (val->nul || !flag_list.s) ? 0 : strlen(flag_list.s);
 
 				LM_DBG("contact cflags: '%.*s'\n", flag_list.len, flag_list.s);