From 0b53e410f8f5cd1341ea492914d9b7fd17f3f6c1 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Mon, 1 Sep 2025 09:18:08 -0700
Subject: [PATCH] [release-branch.go1.25] debug/pe: permit symbols with no name

They are reportedly generated by llvm-mingw clang21.

For #75219
Fixes #75221

Change-Id: I7fa7e13039bc7eee826cc19826985ca0e357a9ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/700137
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
(cherry picked from commit ea00650784bc2909580c7decf729f668349aa939)
Reviewed-on: https://go-review.googlesource.com/c/go/+/708356
---
 src/debug/pe/symbol.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/debug/pe/symbol.go b/src/debug/pe/symbol.go
index 6e8d9d16c2..80acebe9f1 100644
--- a/src/debug/pe/symbol.go
+++ b/src/debug/pe/symbol.go
@@ -98,7 +98,12 @@ func readCOFFSymbols(fh *FileHeader, r io.ReadSeeker) ([]COFFSymbol, error) {
 // isSymNameOffset checks symbol name if it is encoded as offset into string table.
 func isSymNameOffset(name [8]byte) (bool, uint32) {
 	if name[0] == 0 && name[1] == 0 && name[2] == 0 && name[3] == 0 {
-		return true, binary.LittleEndian.Uint32(name[4:])
+		offset := binary.LittleEndian.Uint32(name[4:])
+		if offset == 0 {
+			// symbol has no name
+			return false, 0
+		}
+		return true, offset
 	}
 	return false, 0
 }
-- 
2.52.0