Messages in this thread Patch in this message | | | From | Eric Auger <> | Subject | [RFC 1/3] iommu: Fix merging in iommu_insert_resv_region | Date | Mon, 28 Sep 2020 21:50:35 +0200 |
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We currently fail to merge a region into another one whose top address is ULLONG_MAX. This situation shouldn't have been encountered yet due to the nature of reserved regions being exposed but this would happen if we were to expose regions beyond the reach of dma_mask or beyond the reach of the iommu.
Signed-off-by: Eric Auger <eric.auger@redhat.com> --- drivers/iommu/iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 609bd25bf154..dd8cda340e62 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -423,7 +423,7 @@ static int iommu_insert_resv_region(struct iommu_resv_region *new, check_overlap: top_end = top->start + top->length - 1; - if (iter->start > top_end + 1) { + if (top_end != ULLONG_MAX && iter->start > top_end + 1) { list_move_tail(&iter->list, &stack); } else { top->length = max(top_end, iter_end) - top->start + 1; -- 2.21.3
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