[Qemu-devel] [PATCH] vfio: add check for memory region overflow condition

[Bandan Das <bsd@redhat.com>]

vfio_listener_region_add for a iommu mr results in
an overflow assert since emulated iommu memory region is initialized
with UINT64_MAX. Add a check just like memory_region_size()
does.

Signed-off-by: Bandan Das <bsd@redhat.com>
---
 hw/vfio/common.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index fb588d8..269244b 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -349,7 +349,12 @@ static void vfio_listener_region_add(MemoryListener *listener,
     if (int128_ge(int128_make64(iova), llend)) {
         return;
     }
-    end = int128_get64(llend);
+
+    if (int128_eq(llend, int128_2_64())) {
+            end = UINT64_MAX;
+    } else {
+            end = int128_get64(llend);
+    }
 
     if ((iova < container->min_iova) || ((end - 1) > container->max_iova)) {
         error_report("vfio: IOMMU container %p can't map guest IOVA region"
-- 
2.7.0