From fa123b51ccd173224fb033ddcf148e8a97138127 Mon Sep 17 00:00:00 2001
From: Nikita Popov <nikita.ppv@gmail.com>
Date: Fri, 8 Feb 2019 10:49:54 +0100
Subject: [PATCH] Fix invalid free

---
 ext/standard/fsock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ext/standard/fsock.c b/ext/standard/fsock.c
index aecca52d0ef..f896c70770d 100644
--- a/ext/standard/fsock.c
+++ b/ext/standard/fsock.c
@@ -100,8 +100,9 @@ static void php_fsockopen_stream(INTERNAL_FUNCTION_PARAMETERS, int persistent)
 		if (errstr) {
 			if (zerrstr) {
 				ZEND_TRY_ASSIGN_STR(zerrstr, errstr);
+			} else {
+				zend_string_release(errstr);
 			}
-			zend_string_release(errstr);
 		}
 
 		RETURN_FALSE;