diff --git a/swift/obj/diskfile.py b/swift/obj/diskfile.py
index ed28f7a849..5b99a9cad5 100644
--- a/swift/obj/diskfile.py
+++ b/swift/obj/diskfile.py
@@ -360,6 +360,12 @@ def read_hashes(partition_dir):
             # given invalid input depending on the way in which the
             # input is invalid.
             pass
+
+    # Check for corrupted data that could break os.listdir()
+    for suffix in hashes.keys():
+        if not suffix.isalnum():
+            return {'valid': False}
+
     # hashes.pkl w/o valid updated key is "valid" but "forever old"
     hashes.setdefault('valid', True)
     hashes.setdefault('updated', -1)
diff --git a/test/unit/obj/test_diskfile.py b/test/unit/obj/test_diskfile.py
index 8fa02397be..ecc8c3beab 100644
--- a/test/unit/obj/test_diskfile.py
+++ b/test/unit/obj/test_diskfile.py
@@ -8378,6 +8378,11 @@ class TestHashesHelpers(unittest.TestCase):
         # with the exactly the same value mutation from write_hashes
         self.assertEqual(hashes, result)
 
+    def test_ignore_corrupted_hashes(self):
+        corrupted_hashes = {u'\x00\x00\x00': False, 'valid': True}
+        diskfile.write_hashes(self.testdir, corrupted_hashes)
+        result = diskfile.read_hashes(self.testdir)
+        self.assertFalse(result['valid'])
 
 if __name__ == '__main__':
     unittest.main()