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iommu/vt-d: Fix potential memory leak in intel_setup_irq_remapping() 

After commit e3beca48a4 ("irqdomain/treewide: Keep firmware node
unconditionally allocated"). For tear down scenario, fn is only freed
after fail to allocate ir_domain, though it also should be freed in case
dmar_enable_qi returns error.

Besides free fn, irq_domain and ir_msi_domain need to be removed as well
if intel_setup_irq_remapping fails to enable queued invalidation.

Improve the rewinding path by add out_free_ir_domain and out_free_fwnode
lables per Baolu's suggestion.

Fixes: e3beca48a4 ("irqdomain/treewide: Keep firmware node unconditionally allocated")
Suggested-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20220119063640.16864-1-guoqing.jiang@linux.dev
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20220128031002.2219155-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Guoqing Jiang 2022-01-28 11:10:02 +08:00 committed by Joerg Roedel
parent 30209b9317
commit 99e675d473
1 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/iommu/intel/irq_remapping.c
View File

@ -569,9 +569,8 @@ static int intel_setup_irq_remapping(struct intel_iommu *iommu)
fn, &intel_ir_domain_ops,
iommu);
if (!iommu->ir_domain) {
irq_domain_free_fwnode(fn);
pr_err("IR%d: failed to allocate irqdomain\n", iommu->seq_id);
goto out_free_bitmap;
goto out_free_fwnode;
}
iommu->ir_msi_domain =
arch_create_remap_msi_irq_domain(iommu->ir_domain,
@ -595,7 +594,7 @@ static int intel_setup_irq_remapping(struct intel_iommu *iommu)
if (dmar_enable_qi(iommu)) {
pr_err("Failed to enable queued invalidation\n");
goto out_free_bitmap;
goto out_free_ir_domain;
}
}
@ -619,6 +618,14 @@ static int intel_setup_irq_remapping(struct intel_iommu *iommu)
return 0;
out_free_ir_domain:
if (iommu->ir_msi_domain)
irq_domain_remove(iommu->ir_msi_domain);
iommu->ir_msi_domain = NULL;
irq_domain_remove(iommu->ir_domain);
iommu->ir_domain = NULL;
out_free_fwnode:
irq_domain_free_fwnode(fn);
out_free_bitmap:
bitmap_free(bitmap);
out_free_pages: