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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: Michael Buesch <mb@bu3sch.de> Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -276,21 +276,17 @@ static struct class rfkill_class = {
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static int rfkill_add_switch(struct rfkill *rfkill)
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{
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int retval;
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int error;
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retval = mutex_lock_interruptible(&rfkill_mutex);
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if (retval)
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return retval;
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mutex_lock(&rfkill_mutex);
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retval = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
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if (retval)
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goto out;
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error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
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if (!error)
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list_add_tail(&rfkill->node, &rfkill_list);
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list_add_tail(&rfkill->node, &rfkill_list);
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out:
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mutex_unlock(&rfkill_mutex);
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return retval;
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return error;
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}
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static void rfkill_remove_switch(struct rfkill *rfkill)
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@ -387,6 +383,8 @@ int rfkill_register(struct rfkill *rfkill)
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if (!rfkill->toggle_radio)
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return -EINVAL;
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if (rfkill->type >= RFKILL_TYPE_MAX)
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return -EINVAL;
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snprintf(dev->bus_id, sizeof(dev->bus_id),
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"rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
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