counter: 104-quad-8: Fix use-after-free by quad8_irq_handler

On unbind an irq might be pending which results in quad8_irq_handler()
calling counter_push_event() for a counter that is already unregistered.
This patch fixes that situation by passing the struct counter_device dev
to devm_request_irq() rather than the parent's so that the irq handler
is cleaned before the counter is unregistered.

Fixes: 7aa2ba0 ("counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8")
Cc: Syed Nayyar Waris <[email protected]>
Reported-by: Uwe Kleine-König <[email protected]>
Signed-off-by: William Breathitt Gray <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: William Breathitt Gray

drivers/counter/104-quad-8.c

@@ -1188,8 +1188,8 @@ static int quad8_probe(struct device *dev, unsigned int id)
 	/* Enable all counters and enable interrupt function */
 	outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base[id] + QUAD8_REG_CHAN_OP);
 
-	err = devm_request_irq(dev, irq[id], quad8_irq_handler, IRQF_SHARED,
-			       counter->name, counter);
+	err = devm_request_irq(&counter->dev, irq[id], quad8_irq_handler,
+			       IRQF_SHARED, counter->name, counter);
 	if (err)
 		return err;