fix: add check that trigger type was assigned a meaningful value

Author: 3qupo

src/burp/restore.epp

@@ -9429,6 +9429,7 @@ bool get_trigger_old (BurpGlobals* tdgbl, burp_rel* relation)
 	att_type	attribute;
 	TEXT		name[GDS_NAME_LEN];
 	scan_attr_t		scan_next_attr;
+	bool type_found = false;
 
 	STORE (REQUEST_HANDLE tdgbl->handles_get_trigger_old_req_handle1)
 		X IN RDB$TRIGGERS
@@ -9446,6 +9447,7 @@ bool get_trigger_old (BurpGlobals* tdgbl, burp_rel* relation)
 			{
 			case att_trig_type:
 				type = (enum trig_t) get_int32(tdgbl);
+				type_found = true;
 				break;
 
 			case att_trig_blr:
@@ -9470,6 +9472,12 @@ bool get_trigger_old (BurpGlobals* tdgbl, burp_rel* relation)
 			}
 		}
 
+		if(!type_found || type == trig_none)
+		{
+			BURP_error(136, true);
+			return false;
+		}
+
 		// fill in rest of attributes unique to new trigger format
 
 		TEXT* p = X.RDB$TRIGGER_NAME;