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

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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: 628329d524 ("Input: add IMS Passenger Control Unit driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Johan Hovold
2017-03-16 11:36:13 -07:00
committed by Willy Tarreau
parent e24a53af1b
commit ec5cc03d1d
1 changed files with 4 additions and 0 deletions
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drivers/input/misc/ims-pcu.c
+4
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@@ -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);