From 8638b8cc739ff7b775681d489c608e54a0883b39 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@hack.frob.com>
Date: Thu, 2 May 2013 13:58:07 -0700
Subject: [PATCH] Make sure stat calls diagnose EFAULT for a NULL struct stat
 *.

---
 sysdeps/nacl/xstatconv.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sysdeps/nacl/xstatconv.c b/sysdeps/nacl/xstatconv.c
index 6f4cceed78e..29f8427eaed 100644
--- a/sysdeps/nacl/xstatconv.c
+++ b/sysdeps/nacl/xstatconv.c
@@ -24,6 +24,15 @@ internal_function
 int
 __xstat_conv (int vers, const struct nacl_abi_stat *kbuf, void *ubuf)
 {
+  /* It's kosher enough just to crash here, but there are some
+     existing NaCl tests that like to see EFAULT, and that's what
+     making the IRT call with NULL would give.  */
+  if (__glibc_unlikely (ubuf == NULL))
+    {
+      __set_errno (EFAULT);
+      return -1;
+    }
+
   switch (vers)
     {
     case _STAT_VER_NACL:
-- 
2.47.2