[Zlib-devel] [PATCH] Fix segfault when NULL is passed as path to gzopen*

[Ozgur Murat Homurlu]

Hi,

In gz_open function, path parameter is passed to strlen() without
checking. This causes a segmentation fault if path is passed as NULL.
This patch adds the check:


--- zlib-1.2.5/gzlib.c  2010-04-18 20:53:22.000000000 +0300
+++ zlib-1.2.5-fixed/gzlib.c    2010-12-15 11:31:21.991003500 +0200
@@ -91,6 +91,9 @@
 {
     gz_statep state;

+    if (path == NULL)
+        return NULL;
+
     /* allocate gzFile structure to return */
     state = malloc(sizeof(gz_state));
     if (state == NULL)