From 80d20b918bd8a882043c493a7f958333ecb41727 Mon Sep 17 00:00:00 2001
From: Zackery Spytz <zspytz@gmail.com>
Date: Tue, 20 Feb 2018 14:06:11 -0700
Subject: [PATCH] bpo-31848: Fix broken error handling in Aifc_read.initfp()
 when the SSND chunk is not found (#5240)

Initialize self._ssnd_chunk so that aifc.Error is raised as intended,
not AttributeError.
---
 Lib/aifc.py                                               | 1 +
 Lib/test/test_aifc.py                                     | 8 ++++++++
 Misc/ACKS                                                 | 1 +
 .../next/Library/2018-01-18-23-34-17.bpo-31848.M2cldy.rst | 2 ++
 4 files changed, 12 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2018-01-18-23-34-17.bpo-31848.M2cldy.rst

diff --git a/Lib/aifc.py b/Lib/aifc.py
index e51e8f8e484..3d2dc56de19 100644
--- a/Lib/aifc.py
+++ b/Lib/aifc.py
@@ -322,6 +322,7 @@ class Aifc_read:
         else:
             raise Error('not an AIFF or AIFF-C file')
         self._comm_chunk_read = 0
+        self._ssnd_chunk = None
         while 1:
             self._ssnd_seek_needed = 1
             try:
diff --git a/Lib/test/test_aifc.py b/Lib/test/test_aifc.py
index a064a324705..8fd306a3659 100644
--- a/Lib/test/test_aifc.py
+++ b/Lib/test/test_aifc.py
@@ -266,6 +266,14 @@ class AIFCLowLevelTest(unittest.TestCase):
         b = io.BytesIO(b'FORM' + struct.pack('>L', 4) + b'AIFF')
         self.assertRaises(aifc.Error, aifc.open, b)
 
+    def test_read_no_ssnd_chunk(self):
+        b = b'FORM' + struct.pack('>L', 4) + b'AIFC'
+        b += b'COMM' + struct.pack('>LhlhhLL', 38, 0, 0, 0, 0, 0, 0)
+        b += b'NONE' + struct.pack('B', 14) + b'not compressed' + b'\x00'
+        with self.assertRaisesRegex(aifc.Error, 'COMM chunk and/or SSND chunk'
+                                                ' missing'):
+            aifc.open(io.BytesIO(b))
+
     def test_read_wrong_compression_type(self):
         b = b'FORM' + struct.pack('>L', 4) + b'AIFC'
         b += b'COMM' + struct.pack('>LhlhhLL', 23, 0, 0, 0, 0, 0, 0)
diff --git a/Misc/ACKS b/Misc/ACKS
index ea1d9418870..b15b20e6c1c 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1512,6 +1512,7 @@ Nicholas Spies
 Per Spilling
 Joshua Spoerri
 Noah Spurrier
+Zackery Spytz
 Nathan Srebro
 RajGopal Srinivasan
 Tage Stabell-Kulo
diff --git a/Misc/NEWS.d/next/Library/2018-01-18-23-34-17.bpo-31848.M2cldy.rst b/Misc/NEWS.d/next/Library/2018-01-18-23-34-17.bpo-31848.M2cldy.rst
new file mode 100644
index 00000000000..c8e61acb0b0
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-01-18-23-34-17.bpo-31848.M2cldy.rst
@@ -0,0 +1,2 @@
+Fix the error handling in Aifc_read.initfp() when the SSND chunk is not found.
+Patch by Zackery Spytz.