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Index: usr.sbin/bhyve/virtio.c
===================================================================
--- usr.sbin/bhyve/virtio.c
+++ usr.sbin/bhyve/virtio.c
@@ -225,6 +225,11 @@
addr = atomic_load_64(&vd->addr);
iov[i].iov_len = len;
iov[i].iov_base = paddr_guest2host(ctx, addr, len);
+ if (iov[i].iov_base == NULL) {
+ WPRINTF("%s: invalid guest address 0x%lx len %u\n",
+ __func__, addr, len);
+ return;
+ }
if ((vd->flags & VRING_DESC_F_WRITE) == 0)
reqp->readable++;
else

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