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Input: hanwang - validate number of endpoints before using them

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Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: bba5394ad3 ("Input: add support for Hanwang tablets")
Signed-off-by: Johan Hovold <johan@kernel.org>
Cc: stable@vger.kernel.org	# 2.6.37
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Johan Hovold 2017-03-16 11:39:29 -07:00 committed by Dmitry Torokhov
parent 5cc4a1a9f5
commit ba340d7b83
1 changed files with 3 additions and 0 deletions
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3
drivers/input/tablet/hanwang.c
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@ -340,6 +340,9 @@ static int hanwang_probe(struct usb_interface *intf, const struct usb_device_id
int error; int error;
int i; int i;
if (intf->cur_altsetting->desc.bNumEndpoints < 1)
return -ENODEV;
hanwang = kzalloc(sizeof(struct hanwang), GFP_KERNEL); hanwang = kzalloc(sizeof(struct hanwang), GFP_KERNEL);
input_dev = input_allocate_device(); input_dev = input_allocate_device();
if (!hanwang || !input_dev) { if (!hanwang || !input_dev) {