Index: kern_umtx.c
===================================================================
--- kern_umtx.c	(revision 239132)
+++ kern_umtx.c	(working copy)
@@ -3305,9 +3305,7 @@ umtx_copyin_timeout32(void *addr, struct timespec
 
 	error = copyin(addr, &ts32, sizeof(struct timespec32));
 	if (error == 0) {
-		if (ts32.tv_sec < 0 ||
-		    ts32.tv_nsec >= 1000000000 ||
-		    ts32.tv_nsec < 0)
+		if (ts32.tv_nsec >= 1000000000)
 			error = EINVAL;
 		else {
 			tsp->tv_sec = ts32.tv_sec;
@@ -3331,8 +3329,7 @@ umtx_copyin_umtx_time32(const void *addr, size_t s
 		error = copyin(addr, &t32, sizeof(struct umtx_time32));
 	if (error != 0)
 		return (error);
-	if (t32.timeout.tv_sec < 0 ||
-	    t32.timeout.tv_nsec >= 1000000000 || t32.timeout.tv_nsec < 0)
+	if (t32.timeout.tv_nsec >= 1000000000)
 		return (EINVAL);
 	tp->_timeout.tv_sec = t32.timeout.tv_sec;
 	tp->_timeout.tv_nsec = t32.timeout.tv_nsec;