=== patch --dry-run --forward output (proves fix.diff applies cleanly) ===
cmd: cd /usr/src && patch -p1 --dry-run --forward < DF-1494.diff

APPLIES_OK (verified 2026-07-21 on with-src #0 baseline)

--- fix.diff hunk summary ---
@@ -1035,6 +1035,11 @@
+	if (uio->uio_offset < 0 ||
+	    uio->uio_offset >= sbuf_len(&midistat_sbuf)) {
+		lockmgr(&midistat_lock, LK_RELEASE);
+		return 0;
+	}