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Input: keyboard - fix theoretical race on vt switch

Browse source 
A VT switch can theoretically change fg_console between

        vc = vc_cons[fg_console].d
and
        kbd = kbd_table + fg_console

Fix it by replacing the second fg_console with vc->vc_num.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Alan Jenkins 2009-11-18 00:40:48 -08:00 committed by Dmitry Torokhov
parent 71bb21b677
commit 0c09b2ac35
1 changed files with 2 additions and 2 deletions
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4
drivers/char/keyboard.c
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@ -1136,7 +1136,7 @@ static int emulate_raw(struct vc_data *vc, unsigned int keycode, unsigned char u
static void kbd_rawcode(unsigned char data)
{
struct vc_data *vc = vc_cons[fg_console].d;
kbd = kbd_table + fg_console;
kbd = kbd_table + vc->vc_num;
if (kbd->kbdmode == VC_RAW)
put_queue(vc, data);
}
@ -1157,7 +1157,7 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
tty->driver_data = vc;
}
kbd = kbd_table + fg_console;
kbd = kbd_table + vc->vc_num;
if (keycode == KEY_LEFTALT || keycode == KEY_RIGHTALT)
sysrq_alt = down ? keycode : 0;