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diff --git a/usr.sbin/bhyve/amd64/pci_gvt-d.c b/usr.sbin/bhyve/amd64/pci_gvt-d.c
--- a/usr.sbin/bhyve/amd64/pci_gvt-d.c
+++ b/usr.sbin/bhyve/amd64/pci_gvt-d.c
@@ -222,6 +222,13 @@
opregion->len = header->size * KB;
munmap(header, sizeof(header));
+ if (opregion->len != sizeof(struct igd_opregion)) {
+ warnx("%s: Invalid OpRegion size of 0x%lx", __func__,
+ opregion->len);
+ close(memfd);
+ return (-1);
+ }
+
opregion->hva = mmap(NULL, opregion->len, PROT_READ, MAP_SHARED, memfd,
opregion->hpa);
if (opregion->hva == MAP_FAILED) {

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