devres: fix possible use after free

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index 1ef4ffcdfa55..bd8e788d71e0 100644
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -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);