userns: Fix build of drivers/staging/dgrp

Explicitly test for GLOBAL_ROOT_UID and GLOBAL_ROOT_GID
instead of using 0, allowing dgrp to compile and work
properly when user namespace support is enabled.

Cc: Bill Pemberton <wfp5p@virginia.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/staging/dgrp/dgrp_common.c b/drivers/staging/dgrp/dgrp_common.c
index fce74e7fb834..3553998b72bc 100644
--- a/drivers/staging/dgrp/dgrp_common.c
+++ b/drivers/staging/dgrp/dgrp_common.c
@@ -179,9 +179,9 @@ void dgrp_carrier(struct ch_struct *ch)
  */
 int dgrp_chk_perm(int mode, int op)
 {
-        if (!current_euid())
+        if (!uid_eq(GLOBAL_ROOT_UID, current_euid()))
                 mode >>= 6;
-        else if (in_egroup_p(0))
+        else if (in_egroup_p(GLOBAL_ROOT_GID))
                 mode >>= 3;
 
         if ((mode & op & 0007) == op)