acpi: ec_sys: access user space with get_user()/put_user()

Commit Message

Kulikov Vasiliy Sept. 12, 2010, 6:57 p.m. UTC

None

Patch

diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
index 0e869b3..cc007d8 100644
--- a/drivers/acpi/ec_sys.c
+++ b/drivers/acpi/ec_sys.c
@@ -11,6 +11,7 @@ 
 #include <linux/kernel.h>
 #include <linux/acpi.h>
 #include <linux/debugfs.h>
+#include <linux/uaccess.h>
 #include "internal.h"
 
 MODULE_AUTHOR("Thomas Renninger <[e-mail]>");
@@ -43,7 +44,6 @@  static ssize_t acpi_ec_read_io(struct file *f, char __user *buf,
 	 * 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;
 
@@ -56,9 +56,15 @@  static ssize_t acpi_ec_read_io(struct file *f, char __user *buf,
 		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--;
 	}
@@ -74,7 +80,6 @@  static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf,
 
 	unsigned int size = count;
 	loff_t init_off = *off;
-	u8 *data = (u8 *) buf;
 	int err = 0;
 
 	if (*off >= EC_SPACE_SIZE)
@@ -85,7 +90,12 @@  static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf,
 	}
 
 	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;