Index: sys/security/audit/audit_bsm_klib.c
===================================================================
--- sys/security/audit/audit_bsm_klib.c
+++ sys/security/audit/audit_bsm_klib.c
@@ -437,7 +437,17 @@
 		vp = rdir;
 	else
 		vp = cdir;
-	MPASS(vp != NULL);
+
+	/*
+	 * rdir must not be NULL, but it may be that cdir failed to resolve in
+	 * the caller.
+	 */
+	MPASS(*path != '/' || vp != NULL);
+	if (vp == NULL) {
+		cpath[0] = '\0';
+		return;
+	}
+
 	/*
 	 * NB: We require that the supplied array be at least MAXPATHLEN bytes
 	 * long.  If this is not the case, then we can run into serious trouble.