Fix #78980: pgsqlGetNotify() overlooks dead connection

pgsqlGetNotify() didn't check result of PQconsumeInput().

Author: ranvis

NEWS

@@ -24,6 +24,8 @@ PHP                                                                        NEWS
 - PDO_PgSQL:
   . Fixed bug #78983 (pdo_pgsql config.w32 cannot find libpq-fe.h). (SATŌ
     Kentarō)
+  . Fixed bug #78980 (pgsqlGetNotify() overlooks dead connection). (SATŌ
+    Kentarō)
 
 18 Dec 2019, PHP 7.3.13
 

ext/pdo_pgsql/pgsql_driver.c

@@ -1071,13 +1071,21 @@ static PHP_METHOD(PDO, pgsqlGetNotify)
 
 	H = (pdo_pgsql_db_handle *)dbh->driver_data;
 
-	PQconsumeInput(H->server);
+	if (!PQconsumeInput(H->server)) {
+		pdo_pgsql_error(dbh, PGRES_FATAL_ERROR, NULL);
+		PDO_HANDLE_DBH_ERR();
+		RETURN_FALSE;
+	}
 	pgsql_notify = PQnotifies(H->server);
 
 	if (ms_timeout && !pgsql_notify) {
 		php_pollfd_for_ms(PQsocket(H->server), PHP_POLLREADABLE, (int)ms_timeout);
 
-		PQconsumeInput(H->server);
+		if (!PQconsumeInput(H->server)) {
+			pdo_pgsql_error(dbh, PGRES_FATAL_ERROR, NULL);
+			PDO_HANDLE_DBH_ERR();
+			RETURN_FALSE;
+		}
 		pgsql_notify = PQnotifies(H->server);
 	}