Commit 2827a418 authored Sep 19, 2017 by Alexandru Moise Committed by Thomas Gleixner Sep 25, 2017

genirq: Check __free_irq() return value for NULL



__free_irq() can return a NULL irqaction for example when trying to free
already-free IRQ, but the callsite unconditionally dereferences the
returned pointer.

Fix this by adding a check and return NULL.

Signed-off-by: Alexandru Moise <00moses.alexander00@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20170919200412.GA29985@gmail.com

parent e19b205b

kernel/irq/manage.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1643,6 +1643,10 @@ const void free_irq(unsigned int irq, void dev_id)
		#endif

		action = __free_irq(irq, dev_id);

		if (!action)
		return NULL;

		devname = action->name;
		kfree(action);
		return devname;