linux-kernel - [PATCH 4.20 41/80] iommu/vt-d: Fix memory leak in intel_iommu_put_resv

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Message-Id: <20190204103625.703001782@linuxfoundation.org>
Date:   Mon,  4 Feb 2019 11:37:01 +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,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Eric Auger <eric.auger@...hat.com>,
        Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 4.20 41/80] iommu/vt-d: Fix memory leak in intel_iommu_put_resv_regions()

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gerald Schaefer <gerald.schaefer@...ibm.com>

commit 198bc3252ea3a45b0c5d500e6a5b91cfdd08f001 upstream.

Commit 9d3a4de4cb8d ("iommu: Disambiguate MSI region types") changed
the reserved region type in intel_iommu_get_resv_regions() from
IOMMU_RESV_RESERVED to IOMMU_RESV_MSI, but it forgot to also change
the type in intel_iommu_put_resv_regions().

This leads to a memory leak, because now the check in
intel_iommu_put_resv_regions() for IOMMU_RESV_RESERVED will never
be true, and no allocated regions will be freed.

Fix this by changing the region type in intel_iommu_put_resv_regions()
to IOMMU_RESV_MSI, matching the type of the allocated regions.

Fixes: 9d3a4de4cb8d ("iommu: Disambiguate MSI region types")
Cc: <stable@...r.kernel.org> # v4.11+
Signed-off-by: Gerald Schaefer <gerald.schaefer@...ibm.com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/intel-iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5204,7 +5204,7 @@ static void intel_iommu_put_resv_regions
 	struct iommu_resv_region *entry, *next;

 	list_for_each_entry_safe(entry, next, head, list) {
-		if (entry->type == IOMMU_RESV_RESERVED)
+		if (entry->type == IOMMU_RESV_MSI)
 			kfree(entry);
 	}
 }