From: Johan Hovold <johan@xxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
commit 1916d319271664241b7aa0cd2b05e32bdb310ce9 upstream.
Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack control-interface endpoints.
Fixes: 628329d52474 ("Input: add IMS Passenger Control Unit driver")
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/input/misc/ims-pcu.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/input/misc/ims-pcu.c b/drivers/input/misc/ims-pcu.c
index 77164dc1bedd..8fb814ccfd7a 100644
--- a/drivers/input/misc/ims-pcu.c
+++ b/drivers/input/misc/ims-pcu.c
@@ -1437,6 +1437,10 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc
return -EINVAL;
alt = pcu->ctrl_intf->cur_altsetting;
+
+ if (alt->desc.bNumEndpoints < 1)
+ return -ENODEV;
+
pcu->ep_ctrl = &alt->endpoint[0].desc;
pcu->max_ctrl_size = usb_endpoint_maxp(pcu->ep_ctrl);
--
2.12.2