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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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6bd6ae6396
UI_SET_LEDBIT ioctl() causes the following KASAN splat when used with led > LED_CHARGING: [ 1274.663418] BUG: KASAN: slab-out-of-bounds in input_leds_connect+0x611/0x730 [input_leds] [ 1274.663426] Write of size 8 at addr ffff88003377b2c0 by task ckb-next-daemon/5128 This happens because we were writing to the led structure before making sure that it exists. Reported-by: Tasos Sahanidis <tasos@tasossah.com> Tested-by: Tasos Sahanidis <tasos@tasossah.com> Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
225 lines
5.2 KiB
C
225 lines
5.2 KiB
C
/*
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* LED support for the input layer
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*
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* Copyright 2010-2015 Samuel Thibault <samuel.thibault@ens-lyon.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/leds.h>
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#include <linux/input.h>
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#if IS_ENABLED(CONFIG_VT)
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#define VT_TRIGGER(_name) .trigger = _name
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#else
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#define VT_TRIGGER(_name) .trigger = NULL
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#endif
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static const struct {
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const char *name;
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const char *trigger;
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} input_led_info[LED_CNT] = {
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[LED_NUML] = { "numlock", VT_TRIGGER("kbd-numlock") },
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[LED_CAPSL] = { "capslock", VT_TRIGGER("kbd-capslock") },
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[LED_SCROLLL] = { "scrolllock", VT_TRIGGER("kbd-scrolllock") },
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[LED_COMPOSE] = { "compose" },
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[LED_KANA] = { "kana", VT_TRIGGER("kbd-kanalock") },
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[LED_SLEEP] = { "sleep" } ,
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[LED_SUSPEND] = { "suspend" },
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[LED_MUTE] = { "mute" },
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[LED_MISC] = { "misc" },
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[LED_MAIL] = { "mail" },
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[LED_CHARGING] = { "charging" },
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};
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struct input_led {
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struct led_classdev cdev;
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struct input_handle *handle;
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unsigned int code; /* One of LED_* constants */
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};
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struct input_leds {
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struct input_handle handle;
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unsigned int num_leds;
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struct input_led leds[];
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};
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static enum led_brightness input_leds_brightness_get(struct led_classdev *cdev)
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{
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struct input_led *led = container_of(cdev, struct input_led, cdev);
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struct input_dev *input = led->handle->dev;
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return test_bit(led->code, input->led) ? cdev->max_brightness : 0;
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}
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static void input_leds_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct input_led *led = container_of(cdev, struct input_led, cdev);
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input_inject_event(led->handle, EV_LED, led->code, !!brightness);
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}
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static void input_leds_event(struct input_handle *handle, unsigned int type,
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unsigned int code, int value)
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{
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}
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static int input_leds_get_count(struct input_dev *dev)
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{
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unsigned int led_code;
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int count = 0;
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for_each_set_bit(led_code, dev->ledbit, LED_CNT)
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if (input_led_info[led_code].name)
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count++;
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return count;
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}
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static int input_leds_connect(struct input_handler *handler,
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struct input_dev *dev,
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const struct input_device_id *id)
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{
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struct input_leds *leds;
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struct input_led *led;
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unsigned int num_leds;
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unsigned int led_code;
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int led_no;
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int error;
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num_leds = input_leds_get_count(dev);
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if (!num_leds)
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return -ENXIO;
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leds = kzalloc(sizeof(*leds) + num_leds * sizeof(*leds->leds),
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GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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leds->num_leds = num_leds;
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leds->handle.dev = dev;
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leds->handle.handler = handler;
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leds->handle.name = "leds";
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leds->handle.private = leds;
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error = input_register_handle(&leds->handle);
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if (error)
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goto err_free_mem;
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error = input_open_device(&leds->handle);
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if (error)
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goto err_unregister_handle;
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led_no = 0;
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for_each_set_bit(led_code, dev->ledbit, LED_CNT) {
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if (!input_led_info[led_code].name)
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continue;
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led = &leds->leds[led_no];
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led->handle = &leds->handle;
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led->code = led_code;
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led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s",
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dev_name(&dev->dev),
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input_led_info[led_code].name);
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if (!led->cdev.name) {
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error = -ENOMEM;
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goto err_unregister_leds;
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}
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led->cdev.max_brightness = 1;
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led->cdev.brightness_get = input_leds_brightness_get;
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led->cdev.brightness_set = input_leds_brightness_set;
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led->cdev.default_trigger = input_led_info[led_code].trigger;
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error = led_classdev_register(&dev->dev, &led->cdev);
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if (error) {
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dev_err(&dev->dev, "failed to register LED %s: %d\n",
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led->cdev.name, error);
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kfree(led->cdev.name);
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goto err_unregister_leds;
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}
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led_no++;
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}
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return 0;
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err_unregister_leds:
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while (--led_no >= 0) {
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struct input_led *led = &leds->leds[led_no];
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led_classdev_unregister(&led->cdev);
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kfree(led->cdev.name);
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}
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input_close_device(&leds->handle);
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err_unregister_handle:
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input_unregister_handle(&leds->handle);
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err_free_mem:
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kfree(leds);
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return error;
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}
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static void input_leds_disconnect(struct input_handle *handle)
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{
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struct input_leds *leds = handle->private;
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int i;
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for (i = 0; i < leds->num_leds; i++) {
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struct input_led *led = &leds->leds[i];
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led_classdev_unregister(&led->cdev);
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kfree(led->cdev.name);
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}
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input_close_device(handle);
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input_unregister_handle(handle);
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kfree(leds);
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}
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static const struct input_device_id input_leds_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
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.evbit = { BIT_MASK(EV_LED) },
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},
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{ },
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};
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MODULE_DEVICE_TABLE(input, input_leds_ids);
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static struct input_handler input_leds_handler = {
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.event = input_leds_event,
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.connect = input_leds_connect,
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.disconnect = input_leds_disconnect,
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.name = "leds",
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.id_table = input_leds_ids,
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};
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static int __init input_leds_init(void)
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{
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return input_register_handler(&input_leds_handler);
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}
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module_init(input_leds_init);
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static void __exit input_leds_exit(void)
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{
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input_unregister_handler(&input_leds_handler);
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}
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module_exit(input_leds_exit);
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MODULE_AUTHOR("Samuel Thibault <samuel.thibault@ens-lyon.org>");
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MODULE_AUTHOR("Dmitry Torokhov <dmitry.torokhov@gmail.com>");
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MODULE_DESCRIPTION("Input -> LEDs Bridge");
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MODULE_LICENSE("GPL v2");
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