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![Alan Stern](/assets/img/avatar_default.png)
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>
193 lines
4.2 KiB
C
193 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Force feedback support for ACRUX game controllers
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*
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* From what I have gathered, these devices are mass produced in China
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* by several vendors. They often share the same design as the original
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* Xbox 360 controller.
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*
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* 1a34:0802 "ACRUX USB GAMEPAD 8116"
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* - tested with an EXEQ EQ-PCU-02090 game controller.
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*
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* Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
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*/
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/*
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*/
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#include <linux/input.h>
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#include <linux/slab.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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#ifdef CONFIG_HID_ACRUX_FF
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struct axff_device {
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struct hid_report *report;
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};
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static int axff_play(struct input_dev *dev, void *data, 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 axff_device *axff = data;
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struct hid_report *report = axff->report;
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int field_count = 0;
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int left, right;
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int i, j;
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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", left, right);
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left = left * 0xff / 0xffff;
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right = right * 0xff / 0xffff;
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for (i = 0; i < report->maxfield; i++) {
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for (j = 0; j < report->field[i]->report_count; j++) {
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report->field[i]->value[j] =
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field_count % 2 ? right : left;
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field_count++;
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}
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}
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dbg_hid("running with 0x%02x 0x%02x", left, right);
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hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
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return 0;
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}
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static int axff_init(struct hid_device *hid)
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{
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struct axff_device *axff;
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struct hid_report *report;
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struct hid_input *hidinput;
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struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
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struct input_dev *dev;
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int field_count = 0;
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int i, j;
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int 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_first_entry(&hid->inputs, struct hid_input, list);
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dev = hidinput->input;
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if (list_empty(report_list)) {
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hid_err(hid, "no output reports found\n");
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return -ENODEV;
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}
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report = list_first_entry(report_list, struct hid_report, list);
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for (i = 0; i < report->maxfield; i++) {
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for (j = 0; j < report->field[i]->report_count; j++) {
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report->field[i]->value[j] = 0x00;
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field_count++;
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}
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}
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if (field_count < 4 && hid->product != 0xf705) {
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hid_err(hid, "not enough fields in the report: %d\n",
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field_count);
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return -ENODEV;
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}
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axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
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if (!axff)
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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, axff, axff_play);
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if (error)
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goto err_free_mem;
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axff->report = report;
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hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
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hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
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return 0;
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err_free_mem:
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kfree(axff);
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return error;
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}
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#else
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static inline int axff_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 ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int error;
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dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
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error = hid_parse(hdev);
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if (error) {
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hid_err(hdev, "parse failed\n");
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return error;
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}
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error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
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if (error) {
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hid_err(hdev, "hw start failed\n");
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return error;
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}
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error = axff_init(hdev);
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if (error) {
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/*
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* Do not fail device initialization completely as device
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* may still be partially operable, just warn.
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*/
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hid_warn(hdev,
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"Failed to enable force feedback support, error: %d\n",
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error);
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}
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/*
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* We need to start polling device right away, otherwise
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* it will go into a coma.
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*/
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error = hid_hw_open(hdev);
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if (error) {
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dev_err(&hdev->dev, "hw open failed\n");
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hid_hw_stop(hdev);
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return error;
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}
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return 0;
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}
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static void ax_remove(struct hid_device *hdev)
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{
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hid_hw_close(hdev);
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hid_hw_stop(hdev);
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}
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static const struct hid_device_id ax_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
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{ HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, ax_devices);
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static struct hid_driver ax_driver = {
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.name = "acrux",
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.id_table = ax_devices,
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.probe = ax_probe,
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.remove = ax_remove,
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};
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module_hid_driver(ax_driver);
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MODULE_AUTHOR("Sergei Kolzun");
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MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
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MODULE_LICENSE("GPL");
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