| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 27/88] Input: cm109 - validate number of endpoints before using them | Date | Tue, 28 Mar 2017 14:30:42 +0200 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold <johan@kernel.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@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/input/misc/cm109.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/input/misc/cm109.c +++ b/drivers/input/misc/cm109.c @@ -700,6 +700,10 @@ 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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