Tests for tiff crashes

Tests/check_tiff_crashes.py

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+#!/usr/bin/env python
+
+# Reproductions/tests for crashes/read errors in TiffDecode.c
+
+# When run in python, all of these images should fail for
+# one reason or another, either as a buffer overrun,
+# unrecognized datastream, or truncated image file.
+# There shouldn't be any segfaults.
+#
+# if run like
+# `valgrind --tool=memcheck python check_tiff_crashes.py  2>&1 | grep TiffDecode.c`
+# the output should be empty. There may be python issues
+# in the valgrind especially if run in a debug python
+# version.
+
+
+from PIL import Image
+
+repro_read_strip = ('images/crash_1.tif',
+                    'images/crash_2.tif',
+)
+
+for path in repro_read_strip:
+    with Image.open(path) as im:
+        try:
+            im.load()
+        except Exception as msg:
+            print(msg)