iommu/vt-d: Check for allocation failure in aux_detach_device()

In current kernels small allocations never fail, but checking for
allocation failure is the correct thing to do.

Fixes: 18abda7a2d55 ("iommu/vt-d: Fix general protection fault in aux_detach_device()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/YJuobKuSn81dOPLd@mwanda
Link: https://lore.kernel.org/r/20210519015027.108468-2-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 708f430..9a7b79b 100644 (file)
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4606,6 +4606,8 @@ static int auxiliary_link_device(struct dmar_domain *domain,
 
        if (!sinfo) {
                sinfo = kzalloc(sizeof(*sinfo), GFP_ATOMIC);
+               if (!sinfo)
+                       return -ENOMEM;
                sinfo->domain = domain;
                sinfo->pdev = dev;
                list_add(&sinfo->link_phys, &info->subdevices);