Messages in this thread Patch in this message |  | | | Date | Wed, 15 Jun 2011 20:14:19 +0300 | | From | Maxin B John <> | | Subject | Re: [PATCH] [RESEND] 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> --- diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c index 1ef4ffc..bd8e788 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); diff --git a/lib/devres.c b/lib/devres.c index 6efddf5..7c0e953 100644 --- a/lib/devres.c +++ b/lib/devres.c @@ -79,9 +79,9 @@ EXPORT_SYMBOL(devm_ioremap_nocache); */ void devm_iounmap(struct device *dev, void __iomem *addr) { - iounmap(addr); WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match, (void *)addr)); + iounmap(addr); } EXPORT_SYMBOL(devm_iounmap); diff --git a/mm/dmapool.c b/mm/dmapool.c index 03bf3bb..fbb58e3 100644 --- a/mm/dmapool.c +++ b/mm/dmapool.c @@ -500,7 +500,7 @@ void dmam_pool_destroy(struct dma_pool *pool) { struct device *dev = pool->dev; - dma_pool_destroy(pool); WARN_ON(devres_destroy(dev, dmam_pool_release, dmam_pool_match, pool)); + dma_pool_destroy(pool); } EXPORT_SYMBOL(dmam_pool_destroy);
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