linux-kernel - [PATCH v4 1/8] iommu: Fix a leak in iommu_insert_resv

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Message-Id: <20190527085541.5294-2-eric.auger@redhat.com>
Date:   Mon, 27 May 2019 10:55:34 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com, joro@...tes.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        dwmw2@...radead.org, lorenzo.pieralisi@....com,
        robin.murphy@....com, will.deacon@....com, hanjun.guo@...aro.org,
        sudeep.holla@....com
Cc:     alex.williamson@...hat.com, shameerali.kolothum.thodi@...wei.com
Subject: [PATCH v4 1/8] iommu: Fix a leak in iommu_insert_resv_region

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@...hat.com>
---
 drivers/iommu/iommu.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 67ee6623f9b2..f961f71e4ff8 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -237,18 +237,21 @@ static int iommu_insert_resv_region(struct iommu_resv_region *new,
 			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;
 			}
@@ -261,7 +264,6 @@ static int iommu_insert_resv_region(struct iommu_resv_region *new,
 		return -ENOMEM;
 
 	list_add_tail(&region->list, pos);
-done:
 	return 0;
 }
 
-- 
2.20.1