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From 340c0aaeb771bc3c4b2347e4bcace7afe846907f Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Sat, 13 Jun 2015 16:22:29 +0200
Subject: [PATCH 35/42] qcow2.py: Add required padding for header extensions

Message-id: <1434212556-3927-36-git-send-email-mreitz@redhat.com>
Patchwork-id: 66054
O-Subject: [RHEL-7.2 qemu-kvm PATCH 35/42] qcow2.py: Add required padding for header extensions
Bugzilla: 1129893
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
RH-Acked-by: Fam Zheng <famz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

From: Kevin Wolf <kwolf@redhat.com>

BZ: 1129893

The qcow2 specification requires that the header extension data be
padded to round up the extension size to the next multiple of 8 bytes.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 1416935562-7760-3-git-send-email-kwolf@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 8884dd1bbc5ce42cd657ffcbef3a477443468974)

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 tests/qemu-iotests/qcow2.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/qemu-iotests/qcow2.py b/tests/qemu-iotests/qcow2.py
index 44a2b45..0e343ef 100755
--- a/tests/qemu-iotests/qcow2.py
+++ b/tests/qemu-iotests/qcow2.py
@@ -7,6 +7,10 @@ import string
 class QcowHeaderExtension:
 
     def __init__(self, magic, length, data):
+        if length % 8 != 0:
+            padding = 8 - (length % 8)
+            data += "\0" * padding
+
         self.magic  = magic
         self.length = length
         self.data   = data
-- 
1.8.3.1