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genirq: Ensure IRQ descriptor is valid when setting-up the IRQ

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In the function, setup_irq(), we don't check that the descriptor
returned from irq_to_desc() is valid before we start using it. For
example chip_bus_lock() called from setup_irq(), assumes that the
descriptor pointer is valid and doesn't check before dereferencing it.

In many other functions including setup/free_percpu_irq() we do check
that the descriptor returned is not NULL and therefore add the same test
to setup_irq() to ensure the descriptor returned is valid.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Jon Hunter 2016-05-10 16:14:35 +01:00 • committed by Marc Zyngier
parent 7c9b973061
commit 9b5d585d14
1 changed files with 1 additions and 1 deletions
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2
kernel/irq/manage.c
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@ -1407,7 +1407,7 @@ int setup_irq(unsigned int irq, struct irqaction *act)
int retval; int retval;
struct irq_desc *desc = irq_to_desc(irq); struct irq_desc *desc = irq_to_desc(irq);
if (WARN_ON(irq_settings_is_per_cpu_devid(desc))) if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
return -EINVAL; return -EINVAL;
chip_bus_lock(desc); chip_bus_lock(desc);
retval = __setup_irq(irq, desc, act); retval = __setup_irq(irq, desc, act);