From dec2b4c83dd8b86b56e901f832819e76ff6969df Mon Sep 17 00:00:00 2001
From: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Date: Mon, 27 Oct 2025 16:47:20 +0700
Subject: [PATCH] runtime: avoid bound check in freebsd binuptime

Fixes #76062

Change-Id: I683c1232aaeac12b0b3688472bb277adb95ad542
Reviewed-on: https://go-review.googlesource.com/c/go/+/715180
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
---
 src/runtime/vdso_freebsd.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/runtime/vdso_freebsd.go b/src/runtime/vdso_freebsd.go
index feecada0357..99ca1571a7a 100644
--- a/src/runtime/vdso_freebsd.go
+++ b/src/runtime/vdso_freebsd.go
@@ -54,6 +54,9 @@ func binuptime(abs bool) (bt bintime) {
 		}
 
 		curr := atomic.Load(&timekeepSharedPage.current) // atomic_load_acq_32
+		if curr >= uint32(len(timehands)) {
+			return zeroBintime
+		}
 		th := &timehands[curr]
 		gen := atomic.Load(&th.gen) // atomic_load_acq_32
 		bt = th.offset