From 246db498b90f915289f1c6385c3b8f21871f182d Mon Sep 17 00:00:00 2001
From: cuiweixie <cuiweixie@gmail.com>
Date: Wed, 20 Jul 2022 16:34:00 +0800
Subject: [PATCH] cmd/cgo: panic when length too large

Fixes #53965
---
 src/cmd/cgo/out.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cmd/cgo/out.go b/src/cmd/cgo/out.go
index d6740028da9162..5df9902601a2ee 100644
--- a/src/cmd/cgo/out.go
+++ b/src/cmd/cgo/out.go
@@ -1669,6 +1669,9 @@ const cBytesDef = `
 // freed, such as by calling C.free (be sure to include stdlib.h
 // if C.free is needed).
 func _Cfunc_CBytes(b []byte) unsafe.Pointer {
+	if len(b) > (1<<30) {
+		panic("length of []byte is larger than 1<<30")
+	}
 	p := _cgo_cmalloc(uint64(len(b)))
 	pp := (*[1<<30]byte)(p)
 	copy(pp[:], b)