diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 21085515814f23f09e6fbea4cb49d4d3d99d86c7..4bf7c06c2343e6e09d4fba3bb40254eb65072716 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -433,8 +433,7 @@ static struct port_buffer *alloc_buf(struct virtio_device *vdev, size_t buf_size
 	 * Allocate buffer and the sg list. The sg list array is allocated
 	 * directly after the port_buffer struct.
 	 */
-	buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages,
-		      GFP_KERNEL);
+	buf = kmalloc(struct_size(buf, sg, pages), GFP_KERNEL);
 	if (!buf)
 		goto fail;