提交 7319f1e6 编写于 作者: M Michael Buesch 提交者: David S. Miller

rfkill: Use mutex_lock() at register and add sanity check

Replace mutex_lock_interruptible() by mutex_lock() in rfkill_register(),
as interruptible doesn't make sense there.

Add a sanity check for rfkill->type, as that's used for an unchecked dereference
in an array and might cause hard to debug crashes if the driver sets this
to an invalid value.
Signed-off-by: NMichael Buesch <mb@bu3sch.de>
Signed-off-by: NIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
上级 f51359a8
......@@ -276,21 +276,17 @@ static struct class rfkill_class = {
static int rfkill_add_switch(struct rfkill *rfkill)
{
int retval;
retval = mutex_lock_interruptible(&rfkill_mutex);
if (retval)
return retval;
int error;
retval = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
if (retval)
goto out;
mutex_lock(&rfkill_mutex);
list_add_tail(&rfkill->node, &rfkill_list);
error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
if (!error)
list_add_tail(&rfkill->node, &rfkill_list);
out:
mutex_unlock(&rfkill_mutex);
return retval;
return error;
}
static void rfkill_remove_switch(struct rfkill *rfkill)
......@@ -387,6 +383,8 @@ int rfkill_register(struct rfkill *rfkill)
if (!rfkill->toggle_radio)
return -EINVAL;
if (rfkill->type >= RFKILL_TYPE_MAX)
return -EINVAL;
snprintf(dev->bus_id, sizeof(dev->bus_id),
"rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
......
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