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From 3a8dff1446aaa9a3b93a16ea027214064e84a582 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@rehat.com>
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Date: Thu, 14 Apr 2022 10:38:26 -0400
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Subject: [PATCH 3/3] vhost-vsock: detach the virqueue element in case of error
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 179: vhost-vsock: detach the virqueue element in case of error
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RH-Commit: [1/1] 9275dbff40eb3c7be2abca8369055ca4a1e1e52d (jmaloy/qemu-kvm)
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RH-Bugzilla: 2075640
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2075640
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Upstream: Merged
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CVE: CVE-2022-26354
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commit 8d1b247f3748ac4078524130c6d7ae42b6140aaf
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Author: Stefano Garzarella <sgarzare@redhat.com>
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Date: Mon Feb 28 10:50:58 2022 +0100
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vhost-vsock: detach the virqueue element in case of error
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In vhost_vsock_common_send_transport_reset(), if an element popped from
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the virtqueue is invalid, we should call virtqueue_detach_element() to
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detach it from the virtqueue before freeing its memory.
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Fixes: fc0b9b0e1c ("vhost-vsock: add virtio sockets device")
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Fixes: CVE-2022-26354
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Cc: qemu-stable@nongnu.org
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Reported-by: VictorV <vv474172261@gmail.com>
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Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
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Message-Id: <20220228095058.27899-1-sgarzare@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@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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(cherry picked from commit 8d1b247f3748ac4078524130c6d7ae42b6140aaf)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/virtio/vhost-vsock-common.c | 10 +++++++---
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1 file changed, 7 insertions(+), 3 deletions(-)
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diff --git a/hw/virtio/vhost-vsock-common.c b/hw/virtio/vhost-vsock-common.c
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index 3f3771274e..ed706681ac 100644
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--- a/hw/virtio/vhost-vsock-common.c
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+++ b/hw/virtio/vhost-vsock-common.c
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@@ -153,19 +153,23 @@ static void vhost_vsock_common_send_transport_reset(VHostVSockCommon *vvc)
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if (elem->out_num) {
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error_report("invalid vhost-vsock event virtqueue element with "
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"out buffers");
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- goto out;
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+ goto err;
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}
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if (iov_from_buf(elem->in_sg, elem->in_num, 0,
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&event, sizeof(event)) != sizeof(event)) {
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error_report("vhost-vsock event virtqueue element is too short");
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- goto out;
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+ goto err;
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}
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virtqueue_push(vq, elem, sizeof(event));
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virtio_notify(VIRTIO_DEVICE(vvc), vq);
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-out:
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+ g_free(elem);
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+ return;
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+
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+err:
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+ virtqueue_detach_element(vq, elem, 0);
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g_free(elem);
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}
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--
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2.31.1
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