Memset vhost_dev to zero in the vhost_dev_cleanup function.
This causes dev.vqs to be NULL, so that
vqs does not free up space when calling the g_free function.
This will result in a memory leak. But you can't release vqs
directly in the vhost_dev_cleanup function, because vhost_net
will also call this function, and vhost_net's vqs is assigned by array.
In order to solve this problem, we first save the pointer of vqs,
and release the space of vqs after vhost_dev_cleanup is called.
Signed-off-by: Jian Wang <wangjian161@huawei.com>
---
hw/block/vhost-user-blk.c | 7 +++++--
hw/scsi/vhost-scsi.c | 3 ++-
hw/scsi/vhost-user-scsi.c | 3 ++-
3 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index 1451940..c3af28f 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -250,6 +250,7 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserBlk *s = VHOST_USER_BLK(vdev);
VhostUserState *user;
+ struct vhost_virtqueue *vqs = NULL;
int i, ret;
if (!s->chardev.chr) {
@@ -288,6 +289,7 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
s->dev.vq_index = 0;
s->dev.backend_features = 0;
+ vqs = s->dev.vqs;
vhost_dev_set_config_notifier(&s->dev, &blk_ops);
@@ -314,7 +316,7 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
vhost_err:
vhost_dev_cleanup(&s->dev);
virtio_err:
- g_free(s->dev.vqs);
+ g_free(vqs);
virtio_cleanup(vdev);
vhost_user_cleanup(user);
@@ -326,10 +328,11 @@ static void vhost_user_blk_device_unrealize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserBlk *s = VHOST_USER_BLK(dev);
+ struct vhost_virtqueue *vqs = s->dev.vqs;
vhost_user_blk_set_status(vdev, 0);
vhost_dev_cleanup(&s->dev);
- g_free(s->dev.vqs);
+ g_free(vqs);
virtio_cleanup(vdev);
if (s->vhost_user) {
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 7f21b4f..61e2e57 100644
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -215,6 +215,7 @@ static void vhost_scsi_unrealize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
+ struct vhost_virtqueue *vqs = vsc->dev.vqs;
migrate_del_blocker(vsc->migration_blocker);
error_free(vsc->migration_blocker);
@@ -223,7 +224,7 @@ static void vhost_scsi_unrealize(DeviceState *dev, Error **errp)
vhost_scsi_set_status(vdev, 0);
vhost_dev_cleanup(&vsc->dev);
- g_free(vsc->dev.vqs);
+ g_free(vqs);
virtio_scsi_common_unrealize(dev, errp);
}
diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c
index 2e1ba4a..6728878 100644
--- a/hw/scsi/vhost-user-scsi.c
+++ b/hw/scsi/vhost-user-scsi.c
@@ -121,12 +121,13 @@ static void vhost_user_scsi_unrealize(DeviceState *dev, Error **errp)
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserSCSI *s = VHOST_USER_SCSI(dev);
VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
+ struct vhost_virtqueue *vqs = vsc->dev.vqs;
/* This will stop the vhost backend. */
vhost_user_scsi_set_status(vdev, 0);
vhost_dev_cleanup(&vsc->dev);
- g_free(vsc->dev.vqs);
+ g_free(vqs);
virtio_scsi_common_unrealize(dev, errp);
--
1.8.3.1
On Sat, Dec 22, 2018 at 06:27:28PM +0800, w00426999 wrote: > Memset vhost_dev to zero in the vhost_dev_cleanup function. > This causes dev.vqs to be NULL, so that > vqs does not free up space when calling the g_free function. > This will result in a memory leak. But you can't release vqs > directly in the vhost_dev_cleanup function, because vhost_net > will also call this function, and vhost_net's vqs is assigned by array. > In order to solve this problem, we first save the pointer of vqs, > and release the space of vqs after vhost_dev_cleanup is called. > > Signed-off-by: Jian Wang <wangjian161@huawei.com> > --- > hw/block/vhost-user-blk.c | 7 +++++-- > hw/scsi/vhost-scsi.c | 3 ++- > hw/scsi/vhost-user-scsi.c | 3 ++- > 3 files changed, 9 insertions(+), 4 deletions(-) This patch can go through Michael's tree. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
On 12/22/18 4:27 AM, w00426999 wrote: > Memset vhost_dev to zero in the vhost_dev_cleanup function. > This causes dev.vqs to be NULL, so that > vqs does not free up space when calling the g_free function. > This will result in a memory leak. But you can't release vqs > directly in the vhost_dev_cleanup function, because vhost_net > will also call this function, and vhost_net's vqs is assigned by array. > In order to solve this problem, we first save the pointer of vqs, > and release the space of vqs after vhost_dev_cleanup is called. > > Signed-off-by: Jian Wang <wangjian161@huawei.com> It appears that this is your first qemu contribution - welcome! Your S-o-b tag uses a different spelling "Jian Wang" than your From: line "w00426999". You may want to address your git config settings so that outgoing mail sets the From: line correctly (I'm not sure which config settings are involved; I also know that sometimes you can't control the actual mail From: such as when sending from an address that undergoes list munging due to SPF settings, but in that case git can be told to insert a From: in the message body that will override any From: header). Fixing it now will avoid having to add a .mailmap entry to tie the two spellings together. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
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