Commit 6bed7c1e authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman

Input: ims-pcu - validate number of endpoints before using them

commit 1916d319 upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack control-interface endpoints.

Fixes: 628329d5 ("Input: add IMS Passenger Control Unit driver")
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a07d3669
...@@ -1667,6 +1667,10 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc ...@@ -1667,6 +1667,10 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc
return -EINVAL; return -EINVAL;
alt = pcu->ctrl_intf->cur_altsetting; alt = pcu->ctrl_intf->cur_altsetting;
if (alt->desc.bNumEndpoints < 1)
return -ENODEV;
pcu->ep_ctrl = &alt->endpoint[0].desc; pcu->ep_ctrl = &alt->endpoint[0].desc;
pcu->max_ctrl_size = usb_endpoint_maxp(pcu->ep_ctrl); pcu->max_ctrl_size = usb_endpoint_maxp(pcu->ep_ctrl);
......
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