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[PATCH v2] vhost-vsock: delete vqs in vhost_vsock_unrealize to avoid memleaks

pannengyuan@huawei.com posted 1 patch 4 years, 3 months ago
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git fetch https://github.com/patchew-project/qemu tags/patchew/20200115062535.50644-1-pannengyuan@huawei.com
Maintainers: "Michael S. Tsirkin" <mst@redhat.com>
hw/virtio/vhost-vsock.c         | 12 ++++++++++--
include/hw/virtio/vhost-vsock.h |  2 ++
2 files changed, 12 insertions(+), 2 deletions(-)
[PATCH v2] vhost-vsock: delete vqs in vhost_vsock_unrealize to avoid memleaks
Posted by pannengyuan@huawei.com 4 years, 3 months ago 
From: Pan Nengyuan <pannengyuan@huawei.com>

Receive/transmit/event vqs forgot to cleanup in vhost_vsock_unrealize. This
patch save receive/transmit vq pointer in realize() and cleanup vqs
through those vq pointers in unrealize(). The leak stack is as follow:

Direct leak of 21504 byte(s) in 3 object(s) allocated from:
  #0 0x7f86a1356970 (/lib64/libasan.so.5+0xef970)  ??:?
  #1 0x7f86a09aa49d (/lib64/libglib-2.0.so.0+0x5249d)  ??:?
  #2 0x5604852f85ca (./x86_64-softmmu/qemu-system-x86_64+0x2c3e5ca)  /mnt/sdb/qemu/hw/virtio/virtio.c:2333
  #3 0x560485356208 (./x86_64-softmmu/qemu-system-x86_64+0x2c9c208)  /mnt/sdb/qemu/hw/virtio/vhost-vsock.c:339
  #4 0x560485305a17 (./x86_64-softmmu/qemu-system-x86_64+0x2c4ba17)  /mnt/sdb/qemu/hw/virtio/virtio.c:3531
  #5 0x5604858e6b65 (./x86_64-softmmu/qemu-system-x86_64+0x322cb65)  /mnt/sdb/qemu/hw/core/qdev.c:865
  #6 0x5604861e6c41 (./x86_64-softmmu/qemu-system-x86_64+0x3b2cc41)  /mnt/sdb/qemu/qom/object.c:2102

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
---
Changes V2 to V1:
- delete virtqueues after vhost cleanup to avoid use-after-free
- aslo delete virtqueues in the error path of realize()
---
 hw/virtio/vhost-vsock.c         | 12 ++++++++++--
 include/hw/virtio/vhost-vsock.h |  2 ++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c
index f5744363a8..b6cee479bb 100644
--- a/hw/virtio/vhost-vsock.c
+++ b/hw/virtio/vhost-vsock.c
@@ -335,8 +335,10 @@ static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
                 sizeof(struct virtio_vsock_config));
 
     /* Receive and transmit queues belong to vhost */
-    virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
-    virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
+    vsock->recv_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
+                                      vhost_vsock_handle_output);
+    vsock->trans_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
+                                       vhost_vsock_handle_output);
 
     /* The event queue belongs to QEMU */
     vsock->event_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
@@ -363,6 +365,9 @@ static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
 err_vhost_dev:
     vhost_dev_cleanup(&vsock->vhost_dev);
 err_virtio:
+    virtio_delete_queue(vsock->recv_vq);
+    virtio_delete_queue(vsock->trans_vq);
+    virtio_delete_queue(vsock->event_vq);
     virtio_cleanup(vdev);
     close(vhostfd);
     return;
@@ -379,6 +384,9 @@ static void vhost_vsock_device_unrealize(DeviceState *dev, Error **errp)
     vhost_vsock_set_status(vdev, 0);
 
     vhost_dev_cleanup(&vsock->vhost_dev);
+    virtio_delete_queue(vsock->recv_vq);
+    virtio_delete_queue(vsock->trans_vq);
+    virtio_delete_queue(vsock->event_vq);
     virtio_cleanup(vdev);
 }
 
diff --git a/include/hw/virtio/vhost-vsock.h b/include/hw/virtio/vhost-vsock.h
index d509d67c4a..bc5a988ee5 100644
--- a/include/hw/virtio/vhost-vsock.h
+++ b/include/hw/virtio/vhost-vsock.h
@@ -33,6 +33,8 @@ typedef struct {
     struct vhost_virtqueue vhost_vqs[2];
     struct vhost_dev vhost_dev;
     VirtQueue *event_vq;
+    VirtQueue *recv_vq;
+    VirtQueue *trans_vq;
     QEMUTimer *post_load_timer;
 
     /*< public >*/
-- 
2.21.0.windows.1
Re: [PATCH v2] vhost-vsock: delete vqs in vhost_vsock_unrealize to avoid memleaks
Posted by Stefano Garzarella 4 years, 3 months ago 
On Wed, Jan 15, 2020 at 02:25:35PM +0800, pannengyuan@huawei.com wrote:
> From: Pan Nengyuan <pannengyuan@huawei.com>
> 
> Receive/transmit/event vqs forgot to cleanup in vhost_vsock_unrealize. This
> patch save receive/transmit vq pointer in realize() and cleanup vqs
> through those vq pointers in unrealize(). The leak stack is as follow:
> 
> Direct leak of 21504 byte(s) in 3 object(s) allocated from:
>   #0 0x7f86a1356970 (/lib64/libasan.so.5+0xef970)  ??:?
>   #1 0x7f86a09aa49d (/lib64/libglib-2.0.so.0+0x5249d)  ??:?
>   #2 0x5604852f85ca (./x86_64-softmmu/qemu-system-x86_64+0x2c3e5ca)  /mnt/sdb/qemu/hw/virtio/virtio.c:2333
>   #3 0x560485356208 (./x86_64-softmmu/qemu-system-x86_64+0x2c9c208)  /mnt/sdb/qemu/hw/virtio/vhost-vsock.c:339
>   #4 0x560485305a17 (./x86_64-softmmu/qemu-system-x86_64+0x2c4ba17)  /mnt/sdb/qemu/hw/virtio/virtio.c:3531
>   #5 0x5604858e6b65 (./x86_64-softmmu/qemu-system-x86_64+0x322cb65)  /mnt/sdb/qemu/hw/core/qdev.c:865
>   #6 0x5604861e6c41 (./x86_64-softmmu/qemu-system-x86_64+0x3b2cc41)  /mnt/sdb/qemu/qom/object.c:2102
> 
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
> ---
> Changes V2 to V1:
> - delete virtqueues after vhost cleanup to avoid use-after-free
> - aslo delete virtqueues in the error path of realize()
> ---
>  hw/virtio/vhost-vsock.c         | 12 ++++++++++--
>  include/hw/virtio/vhost-vsock.h |  2 ++
>  2 files changed, 12 insertions(+), 2 deletions(-)

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

> 
> diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c
> index f5744363a8..b6cee479bb 100644
> --- a/hw/virtio/vhost-vsock.c
> +++ b/hw/virtio/vhost-vsock.c
> @@ -335,8 +335,10 @@ static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
>                  sizeof(struct virtio_vsock_config));
>  
>      /* Receive and transmit queues belong to vhost */
> -    virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
> -    virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
> +    vsock->recv_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
> +                                      vhost_vsock_handle_output);
> +    vsock->trans_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
> +                                       vhost_vsock_handle_output);
>  
>      /* The event queue belongs to QEMU */
>      vsock->event_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
> @@ -363,6 +365,9 @@ static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
>  err_vhost_dev:
>      vhost_dev_cleanup(&vsock->vhost_dev);
>  err_virtio:
> +    virtio_delete_queue(vsock->recv_vq);
> +    virtio_delete_queue(vsock->trans_vq);
> +    virtio_delete_queue(vsock->event_vq);
>      virtio_cleanup(vdev);
>      close(vhostfd);
>      return;
> @@ -379,6 +384,9 @@ static void vhost_vsock_device_unrealize(DeviceState *dev, Error **errp)
>      vhost_vsock_set_status(vdev, 0);
>  
>      vhost_dev_cleanup(&vsock->vhost_dev);
> +    virtio_delete_queue(vsock->recv_vq);
> +    virtio_delete_queue(vsock->trans_vq);
> +    virtio_delete_queue(vsock->event_vq);
>      virtio_cleanup(vdev);
>  }
>  
> diff --git a/include/hw/virtio/vhost-vsock.h b/include/hw/virtio/vhost-vsock.h
> index d509d67c4a..bc5a988ee5 100644
> --- a/include/hw/virtio/vhost-vsock.h
> +++ b/include/hw/virtio/vhost-vsock.h
> @@ -33,6 +33,8 @@ typedef struct {
>      struct vhost_virtqueue vhost_vqs[2];
>      struct vhost_dev vhost_dev;
>      VirtQueue *event_vq;
> +    VirtQueue *recv_vq;
> +    VirtQueue *trans_vq;
>      QEMUTimer *post_load_timer;
>  
>      /*< public >*/
> -- 
> 2.21.0.windows.1
> 
> 
> 

--
Re: [PATCH v2] vhost-vsock: delete vqs in vhost_vsock_unrealize to avoid memleaks
Posted by Stefan Hajnoczi 4 years, 3 months ago 
On Wed, Jan 15, 2020 at 02:25:35PM +0800, pannengyuan@huawei.com wrote:
> From: Pan Nengyuan <pannengyuan@huawei.com>
> 
> Receive/transmit/event vqs forgot to cleanup in vhost_vsock_unrealize. This
> patch save receive/transmit vq pointer in realize() and cleanup vqs
> through those vq pointers in unrealize(). The leak stack is as follow:
> 
> Direct leak of 21504 byte(s) in 3 object(s) allocated from:
>   #0 0x7f86a1356970 (/lib64/libasan.so.5+0xef970)  ??:?
>   #1 0x7f86a09aa49d (/lib64/libglib-2.0.so.0+0x5249d)  ??:?
>   #2 0x5604852f85ca (./x86_64-softmmu/qemu-system-x86_64+0x2c3e5ca)  /mnt/sdb/qemu/hw/virtio/virtio.c:2333
>   #3 0x560485356208 (./x86_64-softmmu/qemu-system-x86_64+0x2c9c208)  /mnt/sdb/qemu/hw/virtio/vhost-vsock.c:339
>   #4 0x560485305a17 (./x86_64-softmmu/qemu-system-x86_64+0x2c4ba17)  /mnt/sdb/qemu/hw/virtio/virtio.c:3531
>   #5 0x5604858e6b65 (./x86_64-softmmu/qemu-system-x86_64+0x322cb65)  /mnt/sdb/qemu/hw/core/qdev.c:865
>   #6 0x5604861e6c41 (./x86_64-softmmu/qemu-system-x86_64+0x3b2cc41)  /mnt/sdb/qemu/qom/object.c:2102
> 
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
> ---
> Changes V2 to V1:
> - delete virtqueues after vhost cleanup to avoid use-after-free
> - aslo delete virtqueues in the error path of realize()
> ---
>  hw/virtio/vhost-vsock.c         | 12 ++++++++++--
>  include/hw/virtio/vhost-vsock.h |  2 ++
>  2 files changed, 12 insertions(+), 2 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

Patchew 2.1-devel-0870f84

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