CIFS: iterate over posix acl xattr entry correctly in ACL_to_cifs_posix()

Commit 2211d5ba5c6c ("posix_acl: xattr representation cleanups")
removes the typedefs and the zero-length a_entries array in struct
posix_acl_xattr_header, and uses bare struct posix_acl_xattr_header
and struct posix_acl_xattr_entry directly.

But it failed to iterate over posix acl slots when converting posix
acls to CIFS format, which results in several test failures in
xfstests (generic/053 generic/105) when testing against a samba v1
server, starting from v4.9-rc1 kernel. e.g.

  [root@localhost xfstests]# diff -u tests/generic/105.out /root/xfstests/results//generic/105.out.bad
  --- tests/generic/105.out       2016-09-19 16:33:28.577962575 +0800
  +++ /root/xfstests/results//generic/105.out.bad 2016-10-22 15:41:15.201931110 +0800
  @@ -1,3 +1,4 @@
   QA output created by 105
   -rw-r--r-- root
  +setfacl: subdir: Invalid argument
   -rw-r--r-- root

Fix it by introducing a new "ace" var, like what
cifs_copy_posix_acl() does, and iterating posix acl xattr entries
over it in the for loop.

Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 3f3185febc58..e3fed9249a04 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3427,6 +3427,7 @@ static __u16 ACL_to_cifs_posix(char *parm_data, const char *pACL,
         __u16 rc = 0;
         struct cifs_posix_acl *cifs_acl = (struct cifs_posix_acl *)parm_data;
         struct posix_acl_xattr_header *local_acl = (void *)pACL;
+        struct posix_acl_xattr_entry *ace = (void *)(local_acl + 1);
         int count;
         int i;
 
@@ -3453,8 +3454,7 @@ static __u16 ACL_to_cifs_posix(char *parm_data, const char *pACL,
                 return 0;
         }
         for (i = 0; i < count; i++) {
-                rc = convert_ace_to_cifs_ace(&cifs_acl->ace_array[i],
-                        (struct posix_acl_xattr_entry *)(local_acl + 1));
+                rc = convert_ace_to_cifs_ace(&cifs_acl->ace_array[i], &ace[i]);
                 if (rc != 0) {
                         /* ACE not converted */
                         break;