From: Oliver Neukum Date: Thu, 17 Mar 2016 21:00:17 +0000 (-0700) Subject: Input: ims-pcu - sanity check against missing interfaces X-Git-Tag: v4.5.1~16 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cadaf14c349dfd9dae5113a53f0d7f6d49b9d4ef;p=thirdparty%2Fkernel%2Fstable.git Input: ims-pcu - sanity check against missing interfaces commit a0ad220c96692eda76b2e3fd7279f3dcd1d8a8ff upstream. A malicious device missing interface can make the driver oops. Add sanity checking. Signed-off-by: Oliver Neukum Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/input/misc/ims-pcu.c b/drivers/input/misc/ims-pcu.c index ac1fa5f445805..9c0ea36913b4a 100644 --- a/drivers/input/misc/ims-pcu.c +++ b/drivers/input/misc/ims-pcu.c @@ -1663,6 +1663,8 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc pcu->ctrl_intf = usb_ifnum_to_if(pcu->udev, union_desc->bMasterInterface0); + if (!pcu->ctrl_intf) + return -EINVAL; alt = pcu->ctrl_intf->cur_altsetting; pcu->ep_ctrl = &alt->endpoint[0].desc; @@ -1670,6 +1672,8 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc pcu->data_intf = usb_ifnum_to_if(pcu->udev, union_desc->bSlaveInterface0); + if (!pcu->data_intf) + return -EINVAL; alt = pcu->data_intf->cur_altsetting; if (alt->desc.bNumEndpoints != 2) {