1 files changed, 5 insertions, 1 deletions

diff --git a/src/lib/libc/stdlib/setenv.c b/src/lib/libc/stdlib/setenv.c
index 2e882cdbe6..89d1e88911 100644
--- a/src/lib/libc/stdlib/setenv.c
+++ b/src/lib/libc/stdlib/setenv.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: setenv.c,v 1.11 2009/06/04 20:39:13 millert Exp $ */
+/*      $OpenBSD: setenv.c,v 1.12 2010/06/29 04:09:34 naddy Exp $ */
 /*
  * Copyright (c) 1987 Regents of the University of California.
  * All rights reserved.
@@ -145,6 +145,10 @@ unsetenv(const char *name)
         const char *np;
         int offset;
 
+        if (!name || !*name) {
+                errno = EINVAL;
+                return (-1);
+        }
         for (np = name; *np && *np != '='; ++np)
                 ;
         if (*np) {