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Date:   Tue, 13 Apr 2021 14:54:09 -0500
From:   "Gustavo A. R. Silva" <>
To:     David Woodhouse <>,
        Lu Baolu <>,
        Joerg Roedel <>, Will Deacon <>
        "Gustavo A. R. Silva" <>,
Subject: [PATCH][next] iommu/vt-d: Fix out-bounds-warning in

Replace call to memcpy() with just a couple of simple assignments in
order to fix the following out-of-bounds warning:

drivers/iommu/intel/svm.c:1198:4: warning: 'memcpy' offset [25, 32] from the object at 'desc' is out of the bounds of referenced subobject 'qw2' with type 'long long unsigned int' at offset 16 [-Warray-bounds]

The problem is that the original code is trying to copy data into a
couple of struct members adjacent to each other in a single call to
memcpy(). This causes a legitimate compiler warning because memcpy()
overruns the length of &desc.qw2.

This helps with the ongoing efforts to globally enable -Warray-bounds
and get us closer to being able to tighten the FORTIFY_SOURCE routines
on memcpy().

Signed-off-by: Gustavo A. R. Silva <>
 drivers/iommu/intel/svm.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 5165cea90421..65909f504c50 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -1194,9 +1194,10 @@ int intel_svm_page_response(struct device *dev,
 		desc.qw1 = QI_PGRP_IDX(prm->grpid) | QI_PGRP_LPIG(last_page);
 		desc.qw2 = 0;
 		desc.qw3 = 0;
-		if (private_present)
-			memcpy(&desc.qw2, prm->private_data,
-			       sizeof(prm->private_data));
+		if (private_present) {
+			desc.qw2 = prm->private_data[0];
+			desc.qw3 = prm->private_data[1];
+		}
 		qi_submit_sync(iommu, &desc, 1, 0);

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