From 23357b61f8062a8a8c9c84c0252056cd6d849ec8 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 26 Aug 2020 13:16:29 +0200 Subject: iommu/amd: Prevent NULL pointer dereference Dereferencing irq_data before checking it for NULL is suboptimal. Signed-off-by: Thomas Gleixner Reviewed-by: Joerg Roedel --- drivers/iommu/amd/iommu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/iommu') diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 07ae8b93887e..db44ce67b979 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -3731,8 +3731,8 @@ static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq, for (i = 0; i < nr_irqs; i++) { irq_data = irq_domain_get_irq_data(domain, virq + i); - cfg = irqd_cfg(irq_data); - if (!irq_data || !cfg) { + cfg = irq_data ? irqd_cfg(irq_data) : NULL; + if (!cfg) { ret = -EINVAL; goto out_free_data; } -- cgit v1.2.3