[Xen-changelog] [qemu-xen stable-4.4] net: vmxnet3: avoid memory leakage in activate_device

[patchbot@xxxxxxx]

commit 3f71820abe33f7f32c5983c6b88afc4a992e3c89
Author:     P J P <ppandit@xxxxxxxxxx>
AuthorDate: Tue Dec 15 12:27:54 2015 +0530
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
CommitDate: Fri Feb 5 14:53:53 2016 +0000

    net: vmxnet3: avoid memory leakage in activate_device
    
    Vmxnet3 device emulator does not check if the device is active
    before activating it, also it did not free the transmit & receive
    buffers while deactivating the device, thus resulting in memory
    leakage on the host. This patch fixes both these issues to avoid
    host memory leakage.
    
    Reported-by: Qinghao Tang <luodalongde@xxxxxxxxx>
    Reviewed-by: Dmitry Fleytman <dmitry@xxxxxxxxxx>
    Signed-off-by: Prasad J Pandit <pjp@xxxxxxxxxxxxxxxxx>
    Cc: qemu-stable@xxxxxxxxxx
    Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
 hw/net/vmxnet3.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 1bbea3b..66e4bbb 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -1134,8 +1134,13 @@ static void vmxnet3_reset_mac(VMXNET3State *s)
 
 static void vmxnet3_deactivate_device(VMXNET3State *s)
 {
-    VMW_CBPRN("Deactivating vmxnet3...");
-    s->device_active = false;
+    if (s->device_active) {
+        VMW_CBPRN("Deactivating vmxnet3...");
+        vmxnet_tx_pkt_reset(s->tx_pkt);
+        vmxnet_tx_pkt_uninit(s->tx_pkt);
+        vmxnet_rx_pkt_uninit(s->rx_pkt);
+        s->device_active = false;
+    }
 }
 
 static void vmxnet3_reset(VMXNET3State *s)
@@ -1144,7 +1149,6 @@ static void vmxnet3_reset(VMXNET3State *s)
 
     vmxnet3_deactivate_device(s);
     vmxnet3_reset_interrupt_states(s);
-    vmxnet_tx_pkt_reset(s->tx_pkt);
     s->drv_shmem = 0;
     s->tx_sop = true;
     s->skip_current_tx_pkt = false;
@@ -1361,6 +1365,12 @@ static void vmxnet3_activate_device(VMXNET3State *s)
         return;
     }
 
+    /* Verify if device is active */
+    if (s->device_active) {
+        VMW_CFPRN("Vmxnet3 device is active");
+        return;
+    }
+
     vmxnet3_adjust_by_guest_type(s);
     vmxnet3_update_features(s);
     vmxnet3_update_pm_state(s);
@@ -1554,7 +1564,7 @@ static void vmxnet3_handle_command(VMXNET3State *s, 
uint64_t cmd)
         break;
 
     case VMXNET3_CMD_QUIESCE_DEV:
-        VMW_CBPRN("Set: VMXNET3_CMD_QUIESCE_DEV - pause the device");
+        VMW_CBPRN("Set: VMXNET3_CMD_QUIESCE_DEV - deactivate the device");
         vmxnet3_deactivate_device(s);
         break;
 
@@ -1659,7 +1669,7 @@ vmxnet3_io_bar1_write(void *opaque,
          * shared address only after we get the high part
          */
         if (0 == val) {
-            s->device_active = false;
+            vmxnet3_deactivate_device(s);
         }
         s->temp_shared_guest_driver_memory = val;
         s->drv_shmem = 0;
@@ -1939,9 +1949,7 @@ static bool vmxnet3_peer_has_vnet_hdr(VMXNET3State *s)
 static void vmxnet3_net_uninit(VMXNET3State *s)
 {
     g_free(s->mcast_list);
-    vmxnet_tx_pkt_reset(s->tx_pkt);
-    vmxnet_tx_pkt_uninit(s->tx_pkt);
-    vmxnet_rx_pkt_uninit(s->rx_pkt);
+    vmxnet3_deactivate_device(s);
     qemu_del_nic(s->nic);
 }
 
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#stable-4.4

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