Added reproducer for CVE-2018-4868 to the test suite

tests/bugfixes/github/test_CVE_2018_4868.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+
+import system_tests
+
+
+class TestCvePoC(system_tests.Case):
+
+    url = "https://github.com/Exiv2/exiv2/issues/202"
+    cve_url = "http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4868"
+    found_by = ["afl", "topsecLab", "xcainiao"]
+
+    filename = "{data_path}/exiv2-memorymmap-error"
+    commands = ["{exiv2} " + filename]
+    stdout = [""]
+    stderr = ["""{exiv2_exception_msg} """ + filename + """:
+{error_58_message}
+"""]
+    retval = [1]