File vhost-vsock-detach-the-virqueue-element-.patch of Package qemu.30221

From: Dario Faggioli <dfaggioli@suse.com>
Date: Thu, 3 Aug 2023 16:16:32 +0200
Subject: vhost-vsock: detach the virqueue element in case of error

Git-commit: 8d1b247f3748ac4078524130c6d7ae42b6140aaf
References: bsc#1198712, CVE-2022-26354

In vhost_vsock_common_send_transport_reset(), if an element popped from
the virtqueue is invalid, we should call virtqueue_detach_element() to
detach it from the virtqueue before freeing its memory.

Fixes: fc0b9b0e1c ("vhost-vsock: add virtio sockets device")
Fixes: CVE-2022-26354
Cc: qemu-stable@nongnu.org
Reported-by: VictorV <vv474172261@gmail.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20220228095058.27899-1-sgarzare@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
 hw/virtio/vhost-vsock.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c
index f5744363a8a9847d81f6d5f72671..a03fcc26524d8e1d5a3e1792e664 100644
--- a/hw/virtio/vhost-vsock.c
+++ b/hw/virtio/vhost-vsock.c
@@ -221,19 +221,23 @@ static void vhost_vsock_send_transport_reset(VHostVSock *vsock)
     if (elem->out_num) {
         error_report("invalid vhost-vsock event virtqueue element with "
                      "out buffers");
-        goto out;
+        goto err;
     }
 
     if (iov_from_buf(elem->in_sg, elem->in_num, 0,
                      &event, sizeof(event)) != sizeof(event)) {
         error_report("vhost-vsock event virtqueue element is too short");
-        goto out;
+        goto err;
     }
 
     virtqueue_push(vq, elem, sizeof(event));
     virtio_notify(VIRTIO_DEVICE(vsock), vq);
 
-out:
+    g_free(elem);
+    return;
+
+err:
+    virtqueue_detach_element(vq, elem, 0);
     g_free(elem);
 }