mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 00:40:51 +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>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Force feedback support for Logitech RumblePad and Rumblepad 2
|
|
*
|
|
* Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com>
|
|
*/
|
|
|
|
/*
|
|
*/
|
|
|
|
|
|
#include <linux/input.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/hid.h>
|
|
|
|
#include "hid-lg.h"
|
|
|
|
struct lg2ff_device {
|
|
struct hid_report *report;
|
|
};
|
|
|
|
static int play_effect(struct input_dev *dev, void *data,
|
|
struct ff_effect *effect)
|
|
{
|
|
struct hid_device *hid = input_get_drvdata(dev);
|
|
struct lg2ff_device *lg2ff = data;
|
|
int weak, strong;
|
|
|
|
strong = effect->u.rumble.strong_magnitude;
|
|
weak = effect->u.rumble.weak_magnitude;
|
|
|
|
if (weak || strong) {
|
|
weak = weak * 0xff / 0xffff;
|
|
strong = strong * 0xff / 0xffff;
|
|
|
|
lg2ff->report->field[0]->value[0] = 0x51;
|
|
lg2ff->report->field[0]->value[2] = weak;
|
|
lg2ff->report->field[0]->value[4] = strong;
|
|
} else {
|
|
lg2ff->report->field[0]->value[0] = 0xf3;
|
|
lg2ff->report->field[0]->value[2] = 0x00;
|
|
lg2ff->report->field[0]->value[4] = 0x00;
|
|
}
|
|
|
|
hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
|
|
return 0;
|
|
}
|
|
|
|
int lg2ff_init(struct hid_device *hid)
|
|
{
|
|
struct lg2ff_device *lg2ff;
|
|
struct hid_report *report;
|
|
struct hid_input *hidinput;
|
|
struct input_dev *dev;
|
|
int 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;
|
|
|
|
/* Check that the report looks ok */
|
|
report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
|
|
if (!report)
|
|
return -ENODEV;
|
|
|
|
lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
|
|
if (!lg2ff)
|
|
return -ENOMEM;
|
|
|
|
set_bit(FF_RUMBLE, dev->ffbit);
|
|
|
|
error = input_ff_create_memless(dev, lg2ff, play_effect);
|
|
if (error) {
|
|
kfree(lg2ff);
|
|
return error;
|
|
}
|
|
|
|
lg2ff->report = report;
|
|
report->field[0]->value[0] = 0xf3;
|
|
report->field[0]->value[1] = 0x00;
|
|
report->field[0]->value[2] = 0x00;
|
|
report->field[0]->value[3] = 0x00;
|
|
report->field[0]->value[4] = 0x00;
|
|
report->field[0]->value[5] = 0x00;
|
|
report->field[0]->value[6] = 0x00;
|
|
|
|
hid_hw_request(hid, report, HID_REQ_SET_REPORT);
|
|
|
|
hid_info(hid, "Force feedback for Logitech variant 2 rumble devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
|
|
|
|
return 0;
|
|
}
|