From 403dff4e2c94f275e24fd85f40b2732ffec268a1 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Fri, 7 Nov 2014 08:48:15 -0800 Subject: [PATCH] USB: cdc-acm: check for valid interfaces We need to check that we have both a valid data and control inteface for both types of headers (union and not union.) References: https://bugzilla.kernel.org/show_bug.cgi?id=83551 Reported-by: Simon Schubert <2+kernel@0x2c.org> Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 6c6a5c4cc68c..546a17e8ad5b 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1195,10 +1195,11 @@ next_desc: } else { control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0); data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0)); - if (!control_interface || !data_interface) { - dev_dbg(&intf->dev, "no interfaces\n"); - return -ENODEV; - } + } + + if (!control_interface || !data_interface) { + dev_dbg(&intf->dev, "no interfaces\n"); + return -ENODEV; } if (data_interface_num != call_interface_num)