From 8a7164d080cdffd683cf9bca71953f03d561806f Mon Sep 17 00:00:00 2001
From: Ben Fuhrmannek
Date: Wed, 12 Oct 2016 10:20:38 +0200
Subject: added length check for function_exists

---
 execute.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/execute.c b/execute.c
index 4d5d41b..2d38c3a 100644
--- a/execute.c
+++ b/execute.c
@@ -1087,6 +1087,11 @@ static int ih_function_exists(IH_HANDLER_PARAMS)
 		return 1;
 	}
 
+	if (name_len <= 0) {
+		RETVAL_BOOL(0);
+		return 1;
+	}
+
 	lcname = zend_str_tolower_dup(name, name_len);
 
 	/* Ignore leading "\" */
-- 
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