From 74983d19a41d5fbf006cb269d6b1adc9f705dc99 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Sun, 20 Dec 2020 00:19:37 +0100
Subject: [PATCH] dtoolbase: Fix small memory leak in NeverFreeMemory

It's using a set purely keyed by number of remaining bytes, so if there are two pages with the exact same number of remaining bytes, one of them gets lost.

See #1077
---
 dtool/src/dtoolbase/neverFreeMemory.I | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dtool/src/dtoolbase/neverFreeMemory.I b/dtool/src/dtoolbase/neverFreeMemory.I
index 6e5216e993..bc608040e3 100644
--- a/dtool/src/dtoolbase/neverFreeMemory.I
+++ b/dtool/src/dtoolbase/neverFreeMemory.I
@@ -80,7 +80,11 @@ Page(void *start, size_t size) :
  */
 INLINE bool NeverFreeMemory::Page::
 operator < (const NeverFreeMemory::Page &other) const {
-  return _remaining < other._remaining;
+  if (_remaining != other._remaining) {
+    return _remaining < other._remaining;
+  } else {
+    return _next < other._next;
+  }
 }
 
 /**