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[PATCH v2] vhost-vsock: delete vqs in vhost_vsock_unrealize to avoid mem
From: |
pannengyuan |
Subject: |
[PATCH v2] vhost-vsock: delete vqs in vhost_vsock_unrealize to avoid memleaks |
Date: |
Wed, 15 Jan 2020 14:25:35 +0800 |
From: Pan Nengyuan <address@hidden>
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 <address@hidden>
Signed-off-by: Pan Nengyuan <address@hidden>
---
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
- [PATCH v2] vhost-vsock: delete vqs in vhost_vsock_unrealize to avoid memleaks,
pannengyuan <=