| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 19/76] Input: kbtab - validate number of endpoints before using them | Date | Tue, 28 Mar 2017 14:30:16 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold <johan@kernel.org>
commit cb1b494663e037253337623bf1ef2df727883cb7 upstream.
Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints.
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/tablet/kbtab.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/input/tablet/kbtab.c +++ b/drivers/input/tablet/kbtab.c @@ -122,6 +122,9 @@ static int kbtab_probe(struct usb_interf struct input_dev *input_dev; int error = -ENOMEM; + if (intf->cur_altsetting->desc.bNumEndpoints < 1) + return -ENODEV; + kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL); input_dev = input_allocate_device(); if (!kbtab || !input_dev)
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