From 8bff2ac020508e80aa7f43e35795ae16307a14a0 Mon Sep 17 00:00:00 2001
From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Date: Tue, 20 Dec 2022 15:55:19 -0600
Subject: [PATCH] src: check size of args before using for exec_path

If we are in an artifically created Environment that has no args set,
and uv_exepath returns an error (for instance, if /proc is not mounted
on a Linux system), then we crash with a nullptr deref attempting to
use argv[0].

Fixes: https://github.com/nodejs/node/issues/45901
PR-URL: https://github.com/nodejs/node/pull/45902
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 src/env.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/env.cc b/src/env.cc
index 129f070873517f..9e83b3ddebbb98 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -619,7 +619,7 @@ std::string GetExecPath(const std::vector<std::string>& argv) {
   std::string exec_path;
   if (uv_exepath(exec_path_buf, &exec_path_len) == 0) {
     exec_path = std::string(exec_path_buf, exec_path_len);
-  } else {
+  } else if (argv.size() > 0) {
     exec_path = argv[0];
   }