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vt: fix locking around vt_bind/vt_unbind 

Currently vt_bind and vt_unbind access at least the con_driver object
and registered_con_driver array without holding the console lock. Fix
this by locking around the whole function in each case.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Imre Deak 2014-12-16 00:16:00 +02:00 committed by Greg Kroah-Hartman
parent 2cf30f752c
commit 4c215fe8e2
1 changed files with 5 additions and 6 deletions
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11
drivers/tty/vt/vt.c
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@ -3318,11 +3318,8 @@ static int vt_bind(struct con_driver *con)
if (first == 0 && last == MAX_NR_CONSOLES -1)
deflt = 1;
if (first != -1) {
console_lock();
if (first != -1)
do_bind_con_driver(csw, first, last, deflt);
console_unlock();
}
first = -1;
last = -1;
@ -3362,9 +3359,7 @@ static int vt_unbind(struct con_driver *con)
deflt = 1;
if (first != -1) {
console_lock();
ret = do_unbind_con_driver(csw, first, last, deflt);
console_unlock();
if (ret != 0)
return ret;
}
@ -3394,11 +3389,15 @@ static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
struct con_driver *con = dev_get_drvdata(dev);
int bind = simple_strtoul(buf, NULL, 0);
console_lock();
if (bind)
vt_bind(con);
else
vt_unbind(con);
console_unlock();
return count;
}