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diff --git a/usr.sbin/bhyve/pci_virtio_scsi.c b/usr.sbin/bhyve/pci_virtio_scsi.c
--- a/usr.sbin/bhyve/pci_virtio_scsi.c
+++ b/usr.sbin/bhyve/pci_virtio_scsi.c
@@ -747,8 +747,11 @@
* This will have to change if we begin allowing config space writes
* to change sense size.
*/
- assert(iov_to_buf(req->vsr_iov_in, req->vsr_niov_in,
- (void **)&req->vsr_cmd_rd) == VTSCSI_IN_HEADER_LEN(q->vsq_sc));
+ {
+ ssize_t bufsize = iov_to_buf(req->vsr_iov_in, req->vsr_niov_in,
+ (void **)&req->vsr_cmd_rd);
+ assert(bufsize >= 0 && (size_t)bufsize == VTSCSI_IN_HEADER_LEN(q->vsq_sc));
+ }
/* Make sure this request addresses a valid LUN. */
if (pci_vtscsi_check_lun(req->vsr_cmd_rd->lun) == false) {

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