iommu/vt-d: Fix incorrect pci_for_each_dma_alias() for non-PCI devices

JIRA: https://issues.redhat.com/browse/RHEL-65892
CVE: CVE-2024-50101

commit 6e02a27
Author: Lu Baolu <baolu.lu@linux.intel.com>
Date:   Mon Oct 14 09:37:44 2024 +0800

    iommu/vt-d: Fix incorrect pci_for_each_dma_alias() for non-PCI devices

    Previously, the domain_context_clear() function incorrectly called
    pci_for_each_dma_alias() to set up context entries for non-PCI devices.
    This could lead to kernel hangs or other unexpected behavior.

    Add a check to only call pci_for_each_dma_alias() for PCI devices. For
    non-PCI devices, domain_context_clear_one() is called directly.

    Reported-by: Todd Brandt <todd.e.brandt@intel.com>
    Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219363
    Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219349
    Fixes: 9a16ab9 ("iommu/vt-d: Make context clearing consistent with context mapping")
    Cc: stable@vger.kernel.org
    Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
    Link: https://lore.kernel.org/r/20241014013744.102197-2-baolu.lu@linux.intel.com
    Signed-off-by: Joerg Roedel <jroedel@suse.de>

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

Author: CKI Backport Bot

drivers/iommu/intel/iommu.c

@@ -3520,8 +3520,10 @@ static int domain_context_clear_one_cb(struct pci_dev *pdev, u16 alias, void *op
  */
 static void domain_context_clear(struct device_domain_info *info)
 {
-	if (!dev_is_pci(info->dev))
+	if (!dev_is_pci(info->dev)) {
 		domain_context_clear_one(info, info->bus, info->devfn);
+		return;
+	}
 
 	pci_for_each_dma_alias(to_pci_dev(info->dev),
 			       &domain_context_clear_one_cb, info);