68328serial: check return value of copy_*_user() instead of access_ok()

As copy_*_user() calls access_ok() it should not be called explicitly.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/68328serial.c b/drivers/serial/68328serial.c
index 7356a56..be0ebce 100644 (file)
--- a/drivers/serial/68328serial.c
+++ b/drivers/serial/68328serial.c
@@ -869,7 +869,9 @@ static int get_serial_info(struct m68k_serial * info,
        tmp.close_delay = info->close_delay;
        tmp.closing_wait = info->closing_wait;
        tmp.custom_divisor = info->custom_divisor;
-       copy_to_user(retinfo,&tmp,sizeof(*retinfo));
+       if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+               return -EFAULT;
+
        return 0;
 }
 
@@ -882,7 +884,8 @@ static int set_serial_info(struct m68k_serial * info,
 
        if (!new_info)
                return -EFAULT;
-       copy_from_user(&new_serial,new_info,sizeof(new_serial));
+       if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
+               return -EFAULT;
        old_info = *info;
 
        if (!capable(CAP_SYS_ADMIN)) {
@@ -943,8 +946,7 @@ static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
        status = 0;
 #endif
        local_irq_restore(flags);
-       put_user(status,value);
-       return 0;
+       return put_user(status, value);
 }
 
 /*
@@ -999,27 +1001,18 @@ static int rs_ioctl(struct tty_struct *tty, struct file * file,
                        send_break(info, arg ? arg*(100) : 250);
                        return 0;
                case TIOCGSERIAL:
-                       if (access_ok(VERIFY_WRITE, (void *) arg,
-                                               sizeof(struct serial_struct)))
-                               return get_serial_info(info,
-                                              (struct serial_struct *) arg);
-                       return -EFAULT;
+                       return get_serial_info(info,
+                                      (struct serial_struct *) arg);
                case TIOCSSERIAL:
                        return set_serial_info(info,
                                               (struct serial_struct *) arg);
                case TIOCSERGETLSR: /* Get line status register */
-                       if (access_ok(VERIFY_WRITE, (void *) arg,
-                                               sizeof(unsigned int)))
-                               return get_lsr_info(info, (unsigned int *) arg);
-                       return -EFAULT;
+                       return get_lsr_info(info, (unsigned int *) arg);
                case TIOCSERGSTRUCT:
-                       if (!access_ok(VERIFY_WRITE, (void *) arg,
-                                               sizeof(struct m68k_serial)))
+                       if (copy_to_user((struct m68k_serial *) arg,
+                                   info, sizeof(struct m68k_serial)))
                                return -EFAULT;
-                       copy_to_user((struct m68k_serial *) arg,
-                                   info, sizeof(struct m68k_serial));
                        return 0;
-                       
                default:
                        return -ENOIOCTLCMD;
                }