4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gu Zheng <guzhe...@huawei.com>

commit 497de07d89c1410d76a15bec2bb41f24a2a89f31 upstream.

This change was missed the tmpfs modification in In CVE-2016-7097
commit 073931017b49 ("posix_acl: Clear SGID bit when setting
file permissions")
It can test by xfstest generic/375, which failed to clear
setgid bit in the following test case on tmpfs:

  touch $testfile
  chown 100:100 $testfile
  chmod 2755 $testfile
  _runas -u 100 -g 101 -- setfacl -m u::rwx,g::rwx,o::rwx $testfile

Signed-off-by: Gu Zheng <guzhe...@huawei.com>
Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
Cc: Brad Spengler <spen...@grsecurity.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/posix_acl.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -903,11 +903,10 @@ int simple_set_acl(struct inode *inode,
        int error;
 
        if (type == ACL_TYPE_ACCESS) {
-               error = posix_acl_equiv_mode(acl, &inode->i_mode);
-               if (error < 0)
-                       return 0;
-               if (error == 0)
-                       acl = NULL;
+               error = posix_acl_update_mode(inode,
+                               &inode->i_mode, &acl);
+               if (error)
+                       return error;
        }
 
        inode->i_ctime = CURRENT_TIME;


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