From: Eric Auger <eric.auger@redhat.com>
Date: Mon, 3 Jun 2019 08:53:30 +0200
Subject: iommu: Fix a leak in iommu_insert_resv_region
Git-commit: ad0834dedaa15c3a176f783c0373f836e44b4700
Patch-mainline: v5.3-rc1
References: bsc#1140957

In case we expand an existing region, we unlink
this latter and insert the larger one. In
that case we should free the original region after
the insertion. Also we can immediately return.

Fixes: 6c65fb318e8b ("iommu: iommu_get_group_resv_regions")

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/iommu/iommu.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -205,18 +205,21 @@ static int iommu_insert_resv_region(stru
 			pos = pos->next;
 		} else if ((start >= a) && (end <= b)) {
 			if (new->type == type)
-				goto done;
+				return 0;
 			else
 				pos = pos->next;
 		} else {
 			if (new->type == type) {
 				phys_addr_t new_start = min(a, start);
 				phys_addr_t new_end = max(b, end);
+				int ret;
 
 				list_del(&entry->list);
 				entry->start = new_start;
 				entry->length = new_end - new_start + 1;
-				iommu_insert_resv_region(entry, regions);
+				ret = iommu_insert_resv_region(entry, regions);
+				kfree(entry);
+				return ret;
 			} else {
 				pos = pos->next;
 			}
@@ -229,7 +232,6 @@ insert:
 		return -ENOMEM;
 
 	list_add_tail(&region->list, pos);
-done:
 	return 0;
 }