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genirq: Check __free_irq() return value for NULL

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__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
This commit is contained in:
Alexandru Moise 2017-09-19 22:04:12 +02:00 committed by Thomas Gleixner
parent e19b205be4
commit 2827a418ca
1 changed files with 4 additions and 0 deletions
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4
kernel/irq/manage.c
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@ -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;