Sasha Levin
2021-Jul-10 23:52 UTC
[PATCH AUTOSEL 4.14 21/21] virtio_console: Assure used length from device is limited
From: Xie Yongji <xieyongji at bytedance.com>
[ Upstream commit d00d8da5869a2608e97cfede094dfc5e11462a46 ]
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 at bytedance.com>
Acked-by: Jason Wang <jasowang at redhat.com>
Link: https://lore.kernel.org/r/20210525125622.1203-1-xieyongji at bytedance.com
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
drivers/char/virtio_console.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 6a57237e46db..0fb3a8e62e62 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -489,7 +489,7 @@ 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;
}
@@ -1755,7 +1755,7 @@ 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);
--
2.30.2