Fix CVE-2017-8309:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8309

Patch copied from upstream source repository:

http://git.qemu.org/?p=qemu.git;a=commitdiff;h=3268a845f41253fb55852a8429c32b50f36f349a

From 3268a845f41253fb55852a8429c32b50f36f349a Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 28 Apr 2017 09:56:12 +0200
Subject: [PATCH] audio: release capture buffers

AUD_add_capture() allocates two buffers which are never released.
Add the missing calls to AUD_del_capture().

Impact: Allows vnc clients to exhaust host memory by repeatedly
starting and stopping audio capture.

Fixes: CVE-2017-8309
Cc: P J P <ppandit@redhat.com>
Cc: Huawei PSIRT <PSIRT@huawei.com>
Reported-by: "Jiangxin (hunter, SCC)" <jiangxin1@huawei.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-id: 20170428075612.9997-1-kraxel@redhat.com
---
 audio/audio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/audio/audio.c b/audio/audio.c
index c8898d8422..beafed209b 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -2028,6 +2028,8 @@ void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque)
                     sw = sw1;
                 }
                 QLIST_REMOVE (cap, entries);
+                g_free (cap->hw.mix_buf);
+                g_free (cap->buf);
                 g_free (cap);
             }
             return;
-- 
2.13.0

