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Date: Tue, 28 Mar 2017 14:30:15 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Johan Hovold <johan@...nel.org>, Dmitry Torokhov <dmitry.torokhov@...il.com> Subject: [PATCH 4.4 18/76] Input: cm109 - validate number of endpoints before using them 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold <johan@...nel.org> commit ac2ee9ba953afe88f7a673e1c0c839227b1d7891 upstream. Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints. Fixes: c04148f915e5 ("Input: add driver for USB VoIP phones with CM109...") Signed-off-by: Johan Hovold <johan@...nel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/input/misc/cm109.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/input/misc/cm109.c +++ b/drivers/input/misc/cm109.c @@ -675,6 +675,10 @@ static int cm109_usb_probe(struct usb_in int error = -ENOMEM; interface = intf->cur_altsetting; + + if (interface->desc.bNumEndpoints < 1) + return -ENODEV; + endpoint = &interface->endpoint[0].desc; if (!usb_endpoint_is_int_in(endpoint))
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