From a7fde1c1706a93c304eb301cc290d71c9426493b Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 11 Dec 2018 08:26:49 +0100
Subject: [PATCH] usb-audio: ignore usb packages with wrong size
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usb packets with no payload (zero length) seem to happen in practice for
whatever reason.  Add a check and skip the packet then, otherwise we'll
trigger an assert.

Reported-by: Leonardo Soares Müller <leozinho29_eu@hotmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20181211072649.20700-1-kraxel@redhat.com
---
 hw/usb/dev-audio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/usb/dev-audio.c b/hw/usb/dev-audio.c
index ee43e4914d..28ac7c5165 100644
--- a/hw/usb/dev-audio.c
+++ b/hw/usb/dev-audio.c
@@ -321,6 +321,9 @@ static int streambuf_put(struct streambuf *buf, USBPacket *p)
     if (!free) {
         return 0;
     }
+    if (p->iov.size != USBAUDIO_PACKET_SIZE) {
+        return 0;
+    }
     assert(free >= USBAUDIO_PACKET_SIZE);
     usb_packet_copy(p, buf->data + (buf->prod % buf->size),
                     USBAUDIO_PACKET_SIZE);
-- 
2.11.0