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drivers/char/vt_ioctl.c: fix VT_OPENQRY error value 

When all VT's are in use, VT_OPENQRY casts -1 to unsigned char before
returning it to userspace as an int.  VT255 is not the next available
console.

Signed-off-by: Graham Gower <graham.gower@gmail.com>
Cc: Greg KH <greg@kroah.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Graham Gower 2010-10-27 15:33:00 -07:00 committed by Linus Torvalds
parent 8881cdceb2
commit 1e0ad2881d
1 changed files with 6 additions and 5 deletions
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11
drivers/char/vt_ioctl.c
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@ -503,6 +503,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
struct kbd_struct * kbd;
unsigned int console;
unsigned char ucval;
unsigned int uival;
void __user *up = (void __user *)arg;
int i, perm;
int ret = 0;
@ -657,7 +658,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
break;
case KDGETMODE:
ucval = vc->vc_mode;
uival = vc->vc_mode;
goto setint;
case KDMAPDISP:
@ -695,7 +696,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
break;
case KDGKBMODE:
ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW :
uival = ((kbd->kbdmode == VC_RAW) ? K_RAW :
(kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
(kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
K_XLATE);
@ -717,9 +718,9 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
break;
case KDGKBMETA:
ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
setint:
ret = put_user(ucval, (int __user *)arg);
ret = put_user(uival, (int __user *)arg);
break;
case KDGETKEYCODE:
@ -949,7 +950,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
for (i = 0; i < MAX_NR_CONSOLES; ++i)
if (! VT_IS_IN_USE(i))
break;
ucval = i < MAX_NR_CONSOLES ? (i+1) : -1;
uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
goto setint;
/*