From: Prasad Pandit <p...@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 <p...@fedoraproject.org>
Message-Id: <20230529114333.31686-2-ppan...@redhat.com>
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Reviewed-by: Peter Xu <pet...@redhat.com>
Fixes: c471ad0e9b ("vhost_net: device IOTLB support")
Cc: qemu-sta...@nongnu.org
Acked-by: Jason Wang <jasow...@redhat.com>
---
hw/virtio/vhost.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 7f3c727777..7e1f556994 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -2003,6 +2003,9 @@ 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;
--
MST
