Avoid negative integer overflow when chunkLength == 0.

This fixes #789.
2019-04-25 21:42:54 +01:00
parent f05d100579
commit 8cd95e2218
3 changed files with 25 additions and 5 deletions
@@ -0,0 +1,20 @@
+import system_tests
+
+
+class SegvInPngImageReadMetadata(
+        metaclass=system_tests.CaseMeta):
+    """
+    Regression test for the bug described in:
+    https://github.com/Exiv2/exiv2/issues/789
+    """
+    url = "https://github.com/Exiv2/exiv2/issues/789"
+
+    filename = system_tests.path(
+        "$data_path/issue_789_poc1.png"
+    )
+    commands = ["$exiv2 $filename"]
+    stdout = [""]
+    stderr = [""]
+    retval = [1]
+
+    compare_stderr = system_tests.check_no_ASAN_UBSAN_errors