* sysdeps/generic/setenv.c (setenv): Return -1/EINVAL if name is

	NULL, "" or contains '=' character in it.  Reported by
	Michael T Kerrisk <mtk-lists@gmx.net>.
	* stdlib/tst-environ.c: Include errno.h.
	(main): Add tests for these arguments to setenv/unsetenv.

1 files changed, 6 insertions, 0 deletions

diff --git a/sysdeps/generic/setenv.c b/sysdeps/generic/setenv.c
index a19771391d..48aaecffe0 100644
--- a/sysdeps/generic/setenv.c
+++ b/sysdeps/generic/setenv.c
@@ -265,6 +265,12 @@ setenv (name, value, replace)
      const char *value;
      int replace;
 {
+  if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
   return __add_to_environ (name, value, NULL, replace);
 }