usb: gadget: tcm_usb_gadget: stop format strings

commit aba37fd975f0dd58e025c99c2a79b61b20190831 upstream.

This makes sure that the name coming out of configfs cannot be used
accidentally as a format string.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/tcm_usb_gadget.c b/drivers/usb/gadget/tcm_usb_gadget.c
index 0f8aad7..460c266 100644 (file)
--- a/drivers/usb/gadget/tcm_usb_gadget.c
+++ b/drivers/usb/gadget/tcm_usb_gadget.c
@@ -1613,7 +1613,7 @@ static struct se_wwn *usbg_make_tport(
                return ERR_PTR(-ENOMEM);
        }
        tport->tport_wwpn = wwpn;
-       snprintf(tport->tport_name, sizeof(tport->tport_name), wnn_name);
+       snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
        return &tport->tport_wwn;
 }