b239b0b2d5
- sw_64: Added sw64 architecture related updates - virtio-crypto: verify src&dst buffer length for sym request - vhost-vdpa: do not cleanup the vdpa/vhost-net structures if peer nic is present - qga: Fix suspend on Linux guests without systemd - tests: vhost-user-test: release mutex on protocol violation - qapi: support updating expected test output via make - block: Fix misleading hexadecimal format - block/rbd: fix write zeroes with growing images - block/nbd.c: Fixed IO request coroutine not being wakeup when kill NBD server - block/nfs: Fix 32-bit Windows build - qapi/qdev: Tidy up device_add documentation - hw/xen/xen_pt: fix uninitialized variable - migration/ram: Fix error handling in ram_write_tracking_start() - docs/about/build-platforms: Refine the distro support policy - xen-block: Avoid leaks on new error path - QGA VSS: Add wrapper to send log to debugger and stderr - chardev/char-socket: set s->listener = NULL in char_socket_finalize - qapi/block: Tidy up block-latency-histogram-set documentation - disas/riscv Fix ctzw disassemble - vfio: Fix vfio_get_dev_region() trace event - migration/ram: Fix populate_read_range() - Check and report for incomplete 'global' option format Signed-off-by: Jiabo Feng <fengjiabo1@huawei.com>
60 lines
2.2 KiB
Diff
60 lines
2.2 KiB
Diff
From b6e32ca6cb92d6b1c5414206a262fd72cedd56bc Mon Sep 17 00:00:00 2001
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From: Ani Sinha <anisinha@redhat.com>
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Date: Mon, 19 Jun 2023 12:22:09 +0530
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Subject: [PATCH] vhost-vdpa: do not cleanup the vdpa/vhost-net structures if
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peer nic is present
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When a peer nic is still attached to the vdpa backend, it is too early to free
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up the vhost-net and vdpa structures. If these structures are freed here, then
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QEMU crashes when the guest is being shut down. The following call chain
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would result in an assertion failure since the pointer returned from
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vhost_vdpa_get_vhost_net() would be NULL:
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do_vm_stop() -> vm_state_notify() -> virtio_set_status() ->
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virtio_net_vhost_status() -> get_vhost_net().
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Therefore, we defer freeing up the structures until at guest shutdown
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time when qemu_cleanup() calls net_cleanup() which then calls
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qemu_del_net_client() which would eventually call vhost_vdpa_cleanup()
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again to free up the structures. This time, the loop in net_cleanup()
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ensures that vhost_vdpa_cleanup() will be called one last time when
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all the peer nics are detached and freed.
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All unit tests pass with this change.
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CC: imammedo@redhat.com
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CC: jusual@redhat.com
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CC: mst@redhat.com
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Fixes: CVE-2023-3301
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2128929
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Signed-off-by: Ani Sinha <anisinha@redhat.com>
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Message-Id: <20230619065209.442185-1-anisinha@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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---
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net/vhost-vdpa.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
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index 25dd6dd975..60b715aef1 100644
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--- a/net/vhost-vdpa.c
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+++ b/net/vhost-vdpa.c
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@@ -128,6 +128,14 @@ static void vhost_vdpa_cleanup(NetClientState *nc)
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{
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VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
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+ /*
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+ * If a peer NIC is attached, do not cleanup anything.
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+ * Cleanup will happen as a part of qemu_cleanup() -> net_cleanup()
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+ * when the guest is shutting down.
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+ */
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+ if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
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+ return;
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+ }
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if (s->vhost_net) {
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vhost_net_cleanup(s->vhost_net);
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g_free(s->vhost_net);
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--
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2.41.0.windows.1
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