[patch RFC 01/38] iommu/amd: Prevent NULL pointer dereference

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

Dereferencing irq_data before checking it for NULL is suboptimal.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
---
 drivers/iommu/amd/iommu.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3717,8 +3717,8 @@ static int irq_remapping_alloc(struct ir
 
        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;
                }