added length check for function_exists

1 files changed, 5 insertions, 0 deletions

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 "\" */