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d9d4b1e46d
The syzbot fuzzer found a slab-out-of-bounds write bug in the hid-gaff driver. The problem is caused by the driver's assumption that the device must have an input report. While this will be true for all normal HID input devices, a suitably malicious device can violate the assumption. The same assumption is present in over a dozen other HID drivers. This patch fixes them by checking that the list of hid_inputs for the hid_device is nonempty before allowing it to be used. Reported-and-tested-by: syzbot+403741a091bf41d4ae79@syzkaller.appspotmail.com Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: <stable@vger.kernel.org> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
141 lines
3 KiB
C
141 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Force feedback support for Zeroplus based devices
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*
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* Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
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*/
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/*
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*/
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#include <linux/hid.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include "hid-ids.h"
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#ifdef CONFIG_ZEROPLUS_FF
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struct zpff_device {
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struct hid_report *report;
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};
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static int zpff_play(struct input_dev *dev, void *data,
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struct ff_effect *effect)
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{
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struct hid_device *hid = input_get_drvdata(dev);
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struct zpff_device *zpff = data;
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int left, right;
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/*
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* The following is specified the other way around in the Zeroplus
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* datasheet but the order below is correct for the XFX Executioner;
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* however it is possible that the XFX Executioner is an exception
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*/
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left = effect->u.rumble.strong_magnitude;
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right = effect->u.rumble.weak_magnitude;
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dbg_hid("called with 0x%04x 0x%04x\n", left, right);
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left = left * 0x7f / 0xffff;
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right = right * 0x7f / 0xffff;
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zpff->report->field[2]->value[0] = left;
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zpff->report->field[3]->value[0] = right;
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dbg_hid("running with 0x%02x 0x%02x\n", left, right);
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hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
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return 0;
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}
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static int zpff_init(struct hid_device *hid)
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{
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struct zpff_device *zpff;
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struct hid_report *report;
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struct hid_input *hidinput;
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struct input_dev *dev;
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int i, error;
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if (list_empty(&hid->inputs)) {
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hid_err(hid, "no inputs found\n");
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return -ENODEV;
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}
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hidinput = list_entry(hid->inputs.next, struct hid_input, list);
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dev = hidinput->input;
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for (i = 0; i < 4; i++) {
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report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
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if (!report)
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return -ENODEV;
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}
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zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
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if (!zpff)
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return -ENOMEM;
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set_bit(FF_RUMBLE, dev->ffbit);
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error = input_ff_create_memless(dev, zpff, zpff_play);
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if (error) {
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kfree(zpff);
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return error;
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}
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zpff->report = report;
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zpff->report->field[0]->value[0] = 0x00;
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zpff->report->field[1]->value[0] = 0x02;
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zpff->report->field[2]->value[0] = 0x00;
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zpff->report->field[3]->value[0] = 0x00;
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hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
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hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
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return 0;
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}
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#else
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static inline int zpff_init(struct hid_device *hid)
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{
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return 0;
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}
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#endif
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static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "parse failed\n");
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goto err;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
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if (ret) {
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hid_err(hdev, "hw start failed\n");
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goto err;
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}
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zpff_init(hdev);
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return 0;
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err:
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return ret;
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}
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static const struct hid_device_id zp_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, zp_devices);
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static struct hid_driver zp_driver = {
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.name = "zeroplus",
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.id_table = zp_devices,
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.probe = zp_probe,
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};
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module_hid_driver(zp_driver);
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MODULE_LICENSE("GPL");
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