Some guards and make example_all_functions at least run

src/dict.c

@@ -660,6 +660,10 @@ getdns_pretty_print_dict(struct getdns_dict *dict)
     ldns_buffer *buf;
     char *ret;
 
+    if (!dict) {
+        return NULL;
+    }
+
     buf  = ldns_buffer_new(100);
     if (! buf)
         return NULL;

src/example/example_all_functions.c

@@ -89,10 +89,6 @@ retregular = getdns_context_create(
   boolarg
 );
 
-getdns_context_destroy(
-  contextarg
-);
-
 retregular = getdns_cancel_callback(
   contextarg,
   txidarg
@@ -150,18 +146,19 @@ retregular = getdns_dict_get_bindata(dictarg, charstararg, bindataptrarg);
 retregular = getdns_dict_get_int(dictarg, charstararg, uint32ptrarg);
 
 listarg = getdns_list_create();
-getdns_list_destroy(listarg);
 retregular =  getdns_list_set_dict(listarg, sizetarg, dictarg);
 retregular =  getdns_list_set_list(listarg, sizetarg, listarg);
 retregular =  getdns_list_set_bindata(listarg, sizetarg, bindataarg);
 retregular =  getdns_list_set_int(listarg, sizetarg, uint32arg);
 
 dictarg = getdns_dict_create();
-getdns_dict_destroy(dictarg);
 retregular =  getdns_dict_set_dict(dictarg, charstararg, dictarg);
 retregular =  getdns_dict_set_list(dictarg, charstararg, listarg);
 retregular =  getdns_dict_set_bindata(dictarg, charstararg, bindataarg);
 retregular =  getdns_dict_set_int(dictarg, charstararg, uint32arg);
+retcharstar = getdns_pretty_print_dict(
+  dictarg
+);
 
 retcharstar =  getdns_convert_fqdn_to_dns_name(
   charstararg
@@ -185,10 +182,6 @@ retregular = getdns_validate_dnssec(
   listarg
 );
 
-retcharstar = getdns_pretty_print_dict(
-  dictarg
-);
-
 retcharstar = getdns_display_ip_address(
   bindataarg
 );
@@ -294,4 +287,8 @@ retregular = getdns_context_set_memory_reallocator(
   deallocfunctionarg
 );
 
+getdns_list_destroy(listarg);
+getdns_dict_destroy(dictarg);
+getdns_context_destroy(contextarg);
+
 return(0); }  /* End of main() */

src/general.c

@@ -201,6 +201,10 @@ getdns_general_ub(struct ub_ctx* unbound,
     getdns_return_t gr;
     int r;
 
+    if (!name) {
+        return GETDNS_RETURN_GENERIC_ERROR;
+    }
+
     gr = getdns_context_prepare_for_resolution(context);
     if (gr != GETDNS_RETURN_GOOD) {
         return GETDNS_RETURN_BAD_CONTEXT;