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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/hid/hidraw.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * HID raw devices, giving access to raw HID events.
34  *
....@@ -9,15 +10,6 @@
910  *  Copyright (c) 2007-2014 Jiri Kosina
1011  */
1112 
12
-/*
13
- * This program is free software; you can redistribute it and/or modify it
14
- * under the terms and conditions of the GNU General Public License,
15
- * version 2, as published by the Free Software Foundation.
16
- *
17
- * You should have received a copy of the GNU General Public License along with
18
- * this program; if not, write to the Free Software Foundation, Inc.,
19
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20
- */
2113 
2214 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2315 
....@@ -107,8 +99,6 @@
10799 
108100 /*
109101  * The first byte of the report buffer is expected to be a report number.
110
- *
111
- * This function is to be called with the minors_lock mutex held.
112102  */
113103 static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type)
114104 {
....@@ -116,6 +106,8 @@
116106 	struct hid_device *dev;
117107 	__u8 *buf;
118108 	int ret = 0;
109
+
110
+	lockdep_assert_held(&minors_lock);
119111 
120112 	if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
121113 		ret = -ENODEV;
....@@ -181,8 +173,6 @@
181173  * of buffer is the report number to request, or 0x0 if the defice does not
182174  * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT
183175  * or HID_INPUT_REPORT.
184
- *
185
- * This function is to be called with the minors_lock mutex held.
186176  */
187177 static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type)
188178 {
....@@ -191,6 +181,8 @@
191181 	__u8 *buf;
192182 	int ret = 0, len;
193183 	unsigned char report_number;
184
+
185
+	lockdep_assert_held(&minors_lock);
194186 
195187 	if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
196188 		ret = -ENODEV;
....@@ -205,15 +197,15 @@
205197 	}
206198 
207199 	if (count > HID_MAX_BUFFER_SIZE) {
208
-		printk(KERN_WARNING "hidraw: pid %d passed too large report\n",
209
-				task_pid_nr(current));
200
+		hid_warn(dev, "pid %d passed too large report\n",
201
+			task_pid_nr(current));
210202 		ret = -EINVAL;
211203 		goto out;
212204 	}
213205 
214206 	if (count < 2) {
215
-		printk(KERN_WARNING "hidraw: pid %d passed too short report\n",
216
-				task_pid_nr(current));
207
+		hid_warn(dev, "pid %d passed too short report\n",
208
+			task_pid_nr(current));
217209 		ret = -EINVAL;
218210 		goto out;
219211 	}
....@@ -354,10 +346,13 @@
354346 	unsigned int minor = iminor(inode);
355347 	struct hidraw_list *list = file->private_data;
356348 	unsigned long flags;
349
+	int i;
357350 
358351 	mutex_lock(&minors_lock);
359352 
360353 	spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
354
+	for (i = list->tail; i < list->head; i++)
355
+		kfree(list->buffer[i].value);
361356 	list_del(&list->node);
362357 	spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
363358 	kfree(list);
....@@ -459,6 +454,15 @@
459454 						-EFAULT : len;
460455 					break;
461456 				}
457
+
458
+				if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWUNIQ(0))) {
459
+					int len = strlen(hid->uniq) + 1;
460
+					if (len > _IOC_SIZE(cmd))
461
+						len = _IOC_SIZE(cmd);
462
+					ret = copy_to_user(user_arg, hid->uniq, len) ?
463
+						-EFAULT : len;
464
+					break;
465
+				}
462466 			}
463467 
464468 		ret = -ENOTTY;
....@@ -477,9 +481,7 @@
477481 	.release =      hidraw_release,
478482 	.unlocked_ioctl = hidraw_ioctl,
479483 	.fasync =	hidraw_fasync,
480
-#ifdef CONFIG_COMPAT
481
-	.compat_ioctl   = hidraw_ioctl,
482
-#endif
484
+	.compat_ioctl   = compat_ptr_ioctl,
483485 	.llseek =	noop_llseek,
484486 };
485487 
....@@ -606,7 +608,7 @@
606608 	if (result < 0)
607609 		goto error_class;
608610 
609
-	printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n");
611
+	pr_info("raw HID events driver (C) Jiri Kosina\n");
610612 out:
611613 	return result;
612614