From 8587ba272ede9b6607ec06822e743db71f3ba563 Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Wed, 28 May 2025 11:26:17 +0200
Subject: [PATCH] cmd/cgo: compare malloc return value to NULL instead of
 literal 0

Follow the pattern used in the other _cgoPREFIX_Cfunc* functions. This
also avoids a -Wzero-as-null-pointer-constant warning when compiling
with g++.

Change-Id: I95ac8842df048105f4c738f3603136d9cfa2dfdc
Reviewed-on: https://go-review.googlesource.com/c/go/+/664916
Auto-Submit: Keith Randall <khr@golang.org>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
---
 src/cmd/cgo/out.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cmd/cgo/out.go b/src/cmd/cgo/out.go
index 10870b7c85..dfa54e41d3 100644
--- a/src/cmd/cgo/out.go
+++ b/src/cmd/cgo/out.go
@@ -1812,7 +1812,7 @@ void _cgoPREFIX_Cfunc__Cmalloc(void *v) {
 	void *ret;
 	_cgo_tsan_acquire();
 	ret = malloc(a->p0);
-	if (ret == 0 && a->p0 == 0) {
+	if (ret == NULL && a->p0 == 0) {
 		ret = malloc(1);
 	}
 	a->r1 = ret;
-- 
2.51.0