[PATCH 4.19 37/74] iommu/vt-d: Fix memory leak in intel_iommu_put_resv_regions()

From: Greg Kroah-Hartman
Date: Mon Feb 04 2019 - 06:01:34 EST

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


From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>

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@xxxxxxxxxxxxxxx> # v4.11+
Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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
@@ -5230,7 +5230,7 @@ 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)