linux-kernel - [PATCH 4.19 65/86] iommu/vt-d: Fix potential memory leak in intel_setup_irq

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Message-Id: <20220207103759.692772181@linuxfoundation.org>
Date:   Mon,  7 Feb 2022 12:06:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>,
        Guoqing Jiang <guoqing.jiang@...ux.dev>,
        Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 4.19 65/86] iommu/vt-d: Fix potential memory leak in intel_setup_irq_remapping()

From: Guoqing Jiang <guoqing.jiang@...ux.dev>

commit 99e675d473eb8cf2deac1376a0f840222fc1adcf upstream.

After commit e3beca48a45b ("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: e3beca48a45b ("irqdomain/treewide: Keep firmware node unconditionally allocated")
Suggested-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@...ux.dev>
Link: https://lore.kernel.org/r/20220119063640.16864-1-guoqing.jiang@linux.dev
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Link: https://lore.kernel.org/r/20220128031002.2219155-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iommu/intel_irq_remapping.c |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -543,9 +543,8 @@ static int intel_setup_irq_remapping(str
 					    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,
@@ -569,7 +568,7 @@ static int intel_setup_irq_remapping(str
 
 		if (dmar_enable_qi(iommu)) {
 			pr_err("Failed to enable queued invalidation\n");
-			goto out_free_bitmap;
+			goto out_free_ir_domain;
 		}
 	}
 
@@ -593,6 +592,14 @@ static int intel_setup_irq_remapping(str
 
 	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:
 	kfree(bitmap);
 out_free_pages: