From fffbca55e8a3b5967f4d6ec49f32d95b44487c86 Mon Sep 17 00:00:00 2001
From: Anatol Belski <ab@php.net>
Date: Mon, 11 Jan 2016 20:37:46 +0100
Subject: [PATCH] backport 9a07245b728714de09361ea16b9c6fcf70cb5685 from 7.0

---
 main/main.c               | 19 ++++++++++++++++---
 tests/basic/bug71273.phpt | 21 +++++++++++++++++++++
 2 files changed, 37 insertions(+), 3 deletions(-)
 create mode 100644 tests/basic/bug71273.phpt

diff --git a/main/main.c b/main/main.c
index cc21fbd539..877507d8b8 100644
--- a/main/main.c
+++ b/main/main.c
@@ -788,9 +788,20 @@ PHPAPI void php_verror(const char *docref, const char *params, int type, const c
 	if (PG(html_errors)) {
 		size_t len;
 		char *replace = php_escape_html_entities(buffer, buffer_len, &len, 0, ENT_COMPAT, NULL TSRMLS_CC);
+
+		if (!replace || len < 1) {
+			replace = php_escape_html_entities(buffer, buffer_len, &len, 0, ENT_COMPAT | ENT_HTML_SUBSTITUTE_ERRORS, NULL TSRMLS_CC);
+		}
+
 		efree(buffer);
-		buffer = replace;
-		buffer_len = len;
+
+		if (replace) {
+			buffer = replace;
+			buffer_len = len;
+		} else {
+			buffer = "";
+			buffer_len = 0;
+		}
 	}
 
 	/* which function caused the problem if any at all */
@@ -935,7 +946,9 @@ PHPAPI void php_verror(const char *docref, const char *params, int type, const c
 			zend_hash_update(EG(active_symbol_table), "php_errormsg", sizeof("php_errormsg"), (void **) &tmp, sizeof(zval *), NULL);
 		}
 	}
-	str_efree(buffer);
+	if (buffer_len > 0) {
+		str_efree(buffer);
+	}
 
 	php_error(type, "%s", message);
 	efree(message);
diff --git a/tests/basic/bug71273.phpt b/tests/basic/bug71273.phpt
new file mode 100644
index 0000000000..d0cd72577e
--- /dev/null
+++ b/tests/basic/bug71273.phpt
@@ -0,0 +1,21 @@
+--TEST--
+Bug #71273 A wrong ext directory setup in php.ini leads to crash
+--SKIPIF--
+<?php
+	if ("cli" != php_sapi_name()) {
+		die("skip CLI only");
+	}
+?>
+--FILE--
+<?php
+	/* NOTE this file is required to be encoded in iso-8859-1 */
+
+	$cmd = getenv('TEST_PHP_EXECUTABLE') . " -n -d html_errors=on -d extension_dir=a/é/w -d extension=php_kartoffelbrei.dll -v 2>&1";
+	$out = shell_exec($cmd);
+
+	var_dump(preg_match(",.+a[\\/].+[\\/]w.php_kartoffelbrei.dll.+,s", $out));
+?>
+==DONE==
+--EXPECTF--
+int(1)
+==DONE==
-- 
2.50.1