From 44ace77355798c8d6a72e8b09577dbb80c68441f Mon Sep 17 00:00:00 2001
From: "Todd C. Miller" <Todd.Miller@courtesan.com>
Date: Mon, 15 Jun 2009 13:10:01 +0000
Subject: [PATCH] Return EINVAL in setenv() if var is NULL or the empty string
 to match glibc behavior.

---
 env.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/env.c b/env.c
index 7e8f31fc9..a206b45ae 100644
--- a/env.c
+++ b/env.c
@@ -253,6 +253,9 @@ setenv(var, val, overwrite)
     const char *cp;
     size_t esize;
 
+    if (!var || *var == '\0')
+	return(EINVAL);
+
     /*
      * POSIX says a var name with '=' is an error but BSD
      * just ignores the '=' and anything after it.