--- zzzz-none-000/linux-3.10.107/drivers/acpi/ec_sys.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/acpi/ec_sys.c	2021-02-04 17:41:59.000000000 +0000
@@ -12,6 +12,7 @@
 #include <linux/acpi.h>
 #include <linux/debugfs.h>
 #include <linux/module.h>
+#include <linux/uaccess.h>
 #include "internal.h"
 
 MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
@@ -34,7 +35,6 @@
 	 * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
 	 */
 	unsigned int size = EC_SPACE_SIZE;
-	u8 *data = (u8 *) buf;
 	loff_t init_off = *off;
 	int err = 0;
 
@@ -47,9 +47,15 @@
 		size = count;
 
 	while (size) {
-		err = ec_read(*off, &data[*off - init_off]);
+		u8 byte_read;
+		err = ec_read(*off, &byte_read);
 		if (err)
 			return err;
+		if (put_user(byte_read, buf + *off - init_off)) {
+			if (*off - init_off)
+				return *off - init_off; /* partial read */
+			return -EFAULT;
+		}
 		*off += 1;
 		size--;
 	}
@@ -65,7 +71,6 @@
 
 	unsigned int size = count;
 	loff_t init_off = *off;
-	u8 *data = (u8 *) buf;
 	int err = 0;
 
 	if (*off >= EC_SPACE_SIZE)
@@ -76,7 +81,12 @@
 	}
 
 	while (size) {
-		u8 byte_write = data[*off - init_off];
+		u8 byte_write;
+		if (get_user(byte_write, buf + *off - init_off)) {
+			if (*off - init_off)
+				return *off - init_off; /* partial write */
+			return -EFAULT;
+		}
 		err = ec_write(*off, byte_write);
 		if (err)
 			return err;
@@ -95,7 +105,7 @@
 	.llseek = default_llseek,
 };
 
-int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
+static int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
 {
 	struct dentry *dev_dir;
 	char name[64];
@@ -118,7 +128,7 @@
 	if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
 		goto error;
 	if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
-				 (u32 *)&first_ec->global_lock))
+				 &first_ec->global_lock))
 		goto error;
 
 	if (write_support)