From b9e7998b5351d0ce465e45665f3370896f792bac Mon Sep 17 00:00:00 2001
From: Tim Ledbetter <timledbetter@gmail.com>
Date: Sun, 25 Jun 2023 11:48:40 +0100
Subject: [PATCH] LibC: Return EINVAL from `unsetenv()` if input is empty or
 contains "="

---
 Userland/Libraries/LibC/stdlib.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Userland/Libraries/LibC/stdlib.cpp b/Userland/Libraries/LibC/stdlib.cpp
index bdda8c4310..bedd5f4675 100644
--- a/Userland/Libraries/LibC/stdlib.cpp
+++ b/Userland/Libraries/LibC/stdlib.cpp
@@ -431,6 +431,11 @@ char* secure_getenv(char const* name)
 int unsetenv(char const* name)
 {
     auto new_var_len = strlen(name);
+    if (new_var_len == 0 || strchr(name, '=')) {
+        errno = EINVAL;
+        return -1;
+    }
+
     size_t environ_size = 0;
     int skip = -1;