mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 11:35:07 +07:00
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>
142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Force feedback support for Zeroplus based devices
|
|
*
|
|
* Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
|
|
*/
|
|
|
|
/*
|
|
*/
|
|
|
|
|
|
#include <linux/hid.h>
|
|
#include <linux/input.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "hid-ids.h"
|
|
|
|
#ifdef CONFIG_ZEROPLUS_FF
|
|
|
|
struct zpff_device {
|
|
struct hid_report *report;
|
|
};
|
|
|
|
static int zpff_play(struct input_dev *dev, void *data,
|
|
struct ff_effect *effect)
|
|
{
|
|
struct hid_device *hid = input_get_drvdata(dev);
|
|
struct zpff_device *zpff = data;
|
|
int left, right;
|
|
|
|
/*
|
|
* The following is specified the other way around in the Zeroplus
|
|
* datasheet but the order below is correct for the XFX Executioner;
|
|
* however it is possible that the XFX Executioner is an exception
|
|
*/
|
|
|
|
left = effect->u.rumble.strong_magnitude;
|
|
right = effect->u.rumble.weak_magnitude;
|
|
dbg_hid("called with 0x%04x 0x%04x\n", left, right);
|
|
|
|
left = left * 0x7f / 0xffff;
|
|
right = right * 0x7f / 0xffff;
|
|
|
|
zpff->report->field[2]->value[0] = left;
|
|
zpff->report->field[3]->value[0] = right;
|
|
dbg_hid("running with 0x%02x 0x%02x\n", left, right);
|
|
hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int zpff_init(struct hid_device *hid)
|
|
{
|
|
struct zpff_device *zpff;
|
|
struct hid_report *report;
|
|
struct hid_input *hidinput;
|
|
struct input_dev *dev;
|
|
int i, error;
|
|
|
|
if (list_empty(&hid->inputs)) {
|
|
hid_err(hid, "no inputs found\n");
|
|
return -ENODEV;
|
|
}
|
|
hidinput = list_entry(hid->inputs.next, struct hid_input, list);
|
|
dev = hidinput->input;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
|
|
if (!report)
|
|
return -ENODEV;
|
|
}
|
|
|
|
zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
|
|
if (!zpff)
|
|
return -ENOMEM;
|
|
|
|
set_bit(FF_RUMBLE, dev->ffbit);
|
|
|
|
error = input_ff_create_memless(dev, zpff, zpff_play);
|
|
if (error) {
|
|
kfree(zpff);
|
|
return error;
|
|
}
|
|
|
|
zpff->report = report;
|
|
zpff->report->field[0]->value[0] = 0x00;
|
|
zpff->report->field[1]->value[0] = 0x02;
|
|
zpff->report->field[2]->value[0] = 0x00;
|
|
zpff->report->field[3]->value[0] = 0x00;
|
|
hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
|
|
|
|
hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int zpff_init(struct hid_device *hid)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
|
|
{
|
|
int ret;
|
|
|
|
ret = hid_parse(hdev);
|
|
if (ret) {
|
|
hid_err(hdev, "parse failed\n");
|
|
goto err;
|
|
}
|
|
|
|
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
|
|
if (ret) {
|
|
hid_err(hdev, "hw start failed\n");
|
|
goto err;
|
|
}
|
|
|
|
zpff_init(hdev);
|
|
|
|
return 0;
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static const struct hid_device_id zp_devices[] = {
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(hid, zp_devices);
|
|
|
|
static struct hid_driver zp_driver = {
|
|
.name = "zeroplus",
|
|
.id_table = zp_devices,
|
|
.probe = zp_probe,
|
|
};
|
|
module_hid_driver(zp_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|