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From: Li Qiang <liqiang6-s@360.cn>
Date: Mon, 8 Aug 2016 18:08:31 +0530
Subject: [PATCH] net: vmxnet3: check for device_active before write

Vmxnet3 device emulator does not check if the device is active,
before using it for write. It leads to a use after free issue,
if the vmxnet3_io_bar0_write routine is called after the device is
deactivated. Add check to avoid it.

Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Acked-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit 6c352ca9b4ee3e1e286ea9e8434bd8e69ac7d0d8)
---
 hw/net/vmxnet3.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 20f26b7..a6ce16e 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -1158,6 +1158,10 @@ vmxnet3_io_bar0_write(void *opaque, hwaddr addr,
 {
     VMXNET3State *s = opaque;
 
+    if (!s->device_active) {
+        return;
+    }
+
     if (VMW_IS_MULTIREG_ADDR(addr, VMXNET3_REG_TXPROD,
                         VMXNET3_DEVICE_MAX_TX_QUEUES, VMXNET3_REG_ALIGN)) {
         int tx_queue_idx =