File 0277-net-vmxnet-initialise-local-tx-desc.patch of Package qemu.3217

From f60e43e2888c14f398b55e092bf6494aa4c923b0 Mon Sep 17 00:00:00 2001
From: Li Qiang <liqiang6-s@360.cn>
Date: Wed, 10 Aug 2016 13:17:00 -0600
Subject: [PATCH] net: vmxnet: initialise local tx descriptor

In Vmxnet3 device emulator while processing transmit(tx) queue,
when it reaches end of packet, it calls vmxnet3_complete_packet.
In that local 'txcq_descr' object is not initialised, which could
leak host memory bytes a guest.

Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
[BR: CVE-2016-6836 BSC#994760]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/net/vmxnet3.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 76ba1ee..c1a7eff 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -498,6 +498,7 @@ static void vmxnet3_complete_packet(VMXNET3State *s, int qidx, uint32 tx_ridx)
 
     VMXNET3_RING_DUMP(VMW_RIPRN, "TXC", qidx, &s->txq_descr[qidx].comp_ring);
 
+    memset(&txcq_descr, 0, sizeof(txcq_descr));
     txcq_descr.txdIdx = tx_ridx;
     txcq_descr.gen = vmxnet3_ring_curr_gen(&s->txq_descr[qidx].comp_ring);