From 9c64a09c709e3f995d7f24cdd5a69435c08488fc Mon Sep 17 00:00:00 2001
From: Jade Lovelace <software@lfcode.ca>
Date: Wed, 6 Mar 2024 20:52:58 -0800
Subject: [PATCH] fix: bounds check result in getMaxCPU

Fixes https://github.com/NixOS/nix/issues/9725
---
 src/libutil/current-process.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/libutil/current-process.cc b/src/libutil/current-process.cc
index 47aa137d8..f80f43ef0 100644
--- a/src/libutil/current-process.cc
+++ b/src/libutil/current-process.cc
@@ -38,6 +38,11 @@ unsigned int getMaxCPU()
 
         auto cpuMax = readFile(cpuFile);
         auto cpuMaxParts = tokenizeString<std::vector<std::string>>(cpuMax, " \n");
+
+        if (cpuMaxParts.size() != 2) {
+            return 0;
+        }
+
         auto quota = cpuMaxParts[0];
         auto period = cpuMaxParts[1];
         if (quota != "max")