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devres: fix possible use after free

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devres uses the pointer value as key after it's freed, which is safe but
triggers spurious use-after-free warnings on some static analysis tools.
Rearrange code to avoid such warnings.

Signed-off-by: Maxin B. John <maxin.john@gmail.com>
Reviewed-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Maxin B John 2011-07-25 17:12:59 -07:00 • committed by Linus Torvalds
commit ae891a1b93
3 changed files with 3 additions and 3 deletions
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2
kernel/irq/devres.c
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@ -87,8 +87,8 @@ void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
{
struct irq_devres match_data = { irq, dev_id };
free_irq(irq, dev_id);
WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
&match_data));
free_irq(irq, dev_id);
}
EXPORT_SYMBOL(devm_free_irq);