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4ab25786c8
There are a few very theoretical off-by-one bugs in report descriptor size checking when performing a pre-parsing fixup. Fix those. Cc: stable@vger.kernel.org Reported-by: Ben Hawkes <hawkes@google.com> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
/*
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* HID driver for some cherry "special" devices
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*
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* Copyright (c) 1999 Andreas Gal
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* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
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* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
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* Copyright (c) 2006-2007 Jiri Kosina
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* Copyright (c) 2008 Jiri Slaby
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include "hid-ids.h"
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/*
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* Cherry Cymotion keyboard have an invalid HID report descriptor,
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* that needs fixing before we can parse it.
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*/
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static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
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unsigned int *rsize)
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{
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if (*rsize >= 18 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
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hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
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rdesc[11] = rdesc[16] = 0xff;
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rdesc[12] = rdesc[17] = 0x03;
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}
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return rdesc;
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}
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#define ch_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
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EV_KEY, (c))
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static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
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return 0;
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switch (usage->hid & HID_USAGE) {
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case 0x301: ch_map_key_clear(KEY_PROG1); break;
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case 0x302: ch_map_key_clear(KEY_PROG2); break;
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case 0x303: ch_map_key_clear(KEY_PROG3); break;
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default:
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return 0;
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}
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return 1;
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}
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static const struct hid_device_id ch_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, ch_devices);
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static struct hid_driver ch_driver = {
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.name = "cherry",
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.id_table = ch_devices,
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.report_fixup = ch_report_fixup,
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.input_mapping = ch_input_mapping,
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};
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module_hid_driver(ch_driver);
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MODULE_LICENSE("GPL");
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