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| author |   Xie Yongji <xieyongji@bytedance.com> | 2021-05-25 20:56:22 +0800 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2021-07-03 04:50:53 -0400 |
| commit | d00d8da5869a2608e97cfede094dfc5e11462a46 (patch) | |
| tree | b071750d7d5522c76cbb838c801ac614217d9480 /drivers/char | |
| parent | virtio-blk: limit seg_max to a safe value (diff) | |
| download | linux-dev-d00d8da5869a2608e97cfede094dfc5e11462a46.tar.xz linux-dev-d00d8da5869a2608e97cfede094dfc5e11462a46.zip | |
virtio_console: Assure used length from device is limited
The buf->len might come from an untrusted device. This
ensures the value would not exceed the size of the buffer
to avoid data corruption or loss.
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210525125622.1203-1-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/virtio_console.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 59dfd9c421a1..7eaf303a7a86 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -475,7 +475,7 @@ static struct port_buffer *get_inbuf(struct port *port) buf = virtqueue_get_buf(port->in_vq, &len); if (buf) { - buf->len = len; + buf->len = min_t(size_t, len, buf->size); buf->offset = 0; port->stats.bytes_received += len; } @@ -1709,7 +1709,7 @@ static void control_work_handler(struct work_struct *work) while ((buf = virtqueue_get_buf(vq, &len))) { spin_unlock(&portdev->c_ivq_lock); - buf->len = len; + buf->len = min_t(size_t, len, buf->size); buf->offset = 0; handle_control_message(vq->vdev, portdev, buf); |