From 10560afb540b783da568aebe83d0f782e46bb673 Mon Sep 17 00:00:00 2001
From: Alberto Donizetti <alb.donizetti@gmail.com>
Date: Thu, 20 Oct 2016 11:24:51 +0200
Subject: runtime/debug: avoid overflow in SetMaxThreads

Fixes #16076

Change-Id: I91fa87b642592ee4604537dd8c3197cd61ec8b31
Reviewed-on: https://go-review.googlesource.com/31516
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
---
 src/runtime/proc.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/runtime/proc.go')

diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index f68a189997..9fc24e3ae3 100644
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -4294,7 +4294,11 @@ func runqsteal(_p_, p2 *p, stealRunNextG bool) *g {
 func setMaxThreads(in int) (out int) {
 	lock(&sched.lock)
 	out = int(sched.maxmcount)
-	sched.maxmcount = int32(in)
+	if in > 0x7fffffff { // MaxInt32
+		sched.maxmcount = 0x7fffffff
+	} else {
+		sched.maxmcount = int32(in)
+	}
 	checkmcount()
 	unlock(&sched.lock)
 	return
-- 
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