Convert virtio_console to struct_size

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Kees Cook <keescook@chromium.org>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 2108551..4bf7c06 100644 (file)
--- 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;