From b351086bc4ea965c9a2bed4ccf8c77ac33ef05ce Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Mon, 30 Mar 2026 15:49:31 -0700
Subject: [PATCH] utils: Fix integer underflow in generic vector ostream
 operator

---
 libs/utils/include/utils/ostream.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/libs/utils/include/utils/ostream.h b/libs/utils/include/utils/ostream.h
index de61c70c9f..d3aba2e436 100644
--- a/libs/utils/include/utils/ostream.h
+++ b/libs/utils/include/utils/ostream.h
@@ -130,10 +130,13 @@ private:
 template<template<typename T> class VECTOR, typename T>
 inline ostream& operator<<(ostream& stream, const VECTOR<T>& v) {
     stream << "< ";
-    for (size_t i = 0; i < v.size() - 1; i++) {
-        stream << v[i] << ", ";
+    if (v.size() > 0) {
+        for (size_t i = 0; i < v.size() - 1; i++) {
+            stream << v[i] << ", ";
+        }
+        stream << v[v.size() - 1];
     }
-    stream << v[v.size() - 1] << " >";
+    stream << " >";
     return stream;
 }