| Message ID | 20230529114333.31686-2-ppandit@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vhost: release memory objects in an error path | expand |
On Mon, May 29, 2023 at 05:13:32PM +0530, P J P wrote: > From: Prasad Pandit <pjp@fedoraproject.org> > > vhost_dev_start function does not release memory_listener object > in case of an error. This may crash the guest when vhost is unable > to set memory table: > > stack trace of thread 125653: > Program terminated with signal SIGSEGV, Segmentation fault > #0 memory_listener_register (qemu-kvm + 0x6cda0f) > #1 vhost_dev_start (qemu-kvm + 0x699301) > #2 vhost_net_start (qemu-kvm + 0x45b03f) > #3 virtio_net_set_status (qemu-kvm + 0x665672) > #4 qmp_set_link (qemu-kvm + 0x548fd5) > #5 net_vhost_user_event (qemu-kvm + 0x552c45) > #6 tcp_chr_connect (qemu-kvm + 0x88d473) > #7 tcp_chr_new_client (qemu-kvm + 0x88cf83) > #8 tcp_chr_accept (qemu-kvm + 0x88b429) > #9 qio_net_listener_channel_func (qemu-kvm + 0x7ac07c) > #10 g_main_context_dispatch (libglib-2.0.so.0 + 0x54e2f) > > Release memory_listener objects in the error path. > > Signed-off-by: Prasad Pandit <pjp@fedoraproject.org> Reviewed-by: Peter Xu <peterx@redhat.com> Maybe worthwhile too with: Fixes: c471ad0e9b ("vhost_net: device IOTLB support") > --- > hw/virtio/vhost.c | 3 +++ > 1 file changed, 3 insertions(+) > > v2: split a single patch into two. Mention about vhost set mem table failure > resulting in guest crash. > > diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c > index 23da579ce2..6be4a0626a 100644 > --- a/hw/virtio/vhost.c > +++ b/hw/virtio/vhost.c > @@ -2004,6 +2004,9 @@ fail_vq: > } > > fail_mem: > + if (vhost_dev_has_iommu(hdev)) { > + memory_listener_unregister(&hdev->iommu_listener); > + } > fail_features: > vdev->vhost_started = false; > hdev->started = false; > -- > 2.40.1 >
On Mon, May 29, 2023 at 7:41 PM P J P <ppandit@redhat.com> wrote: > > From: Prasad Pandit <pjp@fedoraproject.org> > > vhost_dev_start function does not release memory_listener object > in case of an error. This may crash the guest when vhost is unable > to set memory table: > > stack trace of thread 125653: > Program terminated with signal SIGSEGV, Segmentation fault > #0 memory_listener_register (qemu-kvm + 0x6cda0f) > #1 vhost_dev_start (qemu-kvm + 0x699301) > #2 vhost_net_start (qemu-kvm + 0x45b03f) > #3 virtio_net_set_status (qemu-kvm + 0x665672) > #4 qmp_set_link (qemu-kvm + 0x548fd5) > #5 net_vhost_user_event (qemu-kvm + 0x552c45) > #6 tcp_chr_connect (qemu-kvm + 0x88d473) > #7 tcp_chr_new_client (qemu-kvm + 0x88cf83) > #8 tcp_chr_accept (qemu-kvm + 0x88b429) > #9 qio_net_listener_channel_func (qemu-kvm + 0x7ac07c) > #10 g_main_context_dispatch (libglib-2.0.so.0 + 0x54e2f) > > Release memory_listener objects in the error path. > > Signed-off-by: Prasad Pandit <pjp@fedoraproject.org> Cc: qemu-stable@nongnu.org Acked-by: Jason Wang <jasowang@redhat.com> Thanks > --- > hw/virtio/vhost.c | 3 +++ > 1 file changed, 3 insertions(+) > > v2: split a single patch into two. Mention about vhost set mem table failure > resulting in guest crash. > > diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c > index 23da579ce2..6be4a0626a 100644 > --- a/hw/virtio/vhost.c > +++ b/hw/virtio/vhost.c > @@ -2004,6 +2004,9 @@ fail_vq: > } > > fail_mem: > + if (vhost_dev_has_iommu(hdev)) { > + memory_listener_unregister(&hdev->iommu_listener); > + } > fail_features: > vdev->vhost_started = false; > hdev->started = false; > -- > 2.40.1 >
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 23da579ce2..6be4a0626a 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -2004,6 +2004,9 @@ fail_vq: } fail_mem: + if (vhost_dev_has_iommu(hdev)) { + memory_listener_unregister(&hdev->iommu_listener); + } fail_features: vdev->vhost_started = false; hdev->started = false;