From: Oliver Neukum oneukum@suse.com
commit 2b8bd606b1e60ca28c765f69c1eedd7d2a2e9dca upstream.
It is not enough to check for the number of endpoints. The types must also be correct.
Reported-and-tested-by: syzbot+48a2851be24583b864dc@syzkaller.appspotmail.com Signed-off-by: Oliver Neukum oneukum@suse.com Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Lee Jones lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/mfd/dln2.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c index 90e7899..1476465 100644 --- a/drivers/mfd/dln2.c +++ b/drivers/mfd/dln2.c @@ -725,6 +725,8 @@ static int dln2_probe(struct usb_interface *interface, const struct usb_device_id *usb_id) { struct usb_host_interface *hostif = interface->cur_altsetting; + struct usb_endpoint_descriptor *epin; + struct usb_endpoint_descriptor *epout; struct device *dev = &interface->dev; struct dln2_dev *dln2; int ret; @@ -734,12 +736,19 @@ static int dln2_probe(struct usb_interface *interface, hostif->desc.bNumEndpoints < 2) return -ENODEV;
+ epin = &hostif->endpoint[0].desc; + epout = &hostif->endpoint[1].desc; + if (!usb_endpoint_is_bulk_out(epout)) + return -ENODEV; + if (!usb_endpoint_is_bulk_in(epin)) + return -ENODEV; + dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL); if (!dln2) return -ENOMEM;
- dln2->ep_out = hostif->endpoint[0].desc.bEndpointAddress; - dln2->ep_in = hostif->endpoint[1].desc.bEndpointAddress; + dln2->ep_out = epout->bEndpointAddress; + dln2->ep_in = epin->bEndpointAddress; dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface)); dln2->interface = interface; usb_set_intfdata(interface, dln2);