sunrpc: Use gid_valid to test for gid != INVALID_GID

In auth unix there are a couple of places INVALID_GID is used a
sentinel to mark the end of uc_gids array.  Use gid_valid
as a type safe way to verify we have not hit the end of
valid data in the array.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
index 55b6ca6fbbd3..c434fde2079b 100644
--- a/net/sunrpc/auth_unix.c
+++ b/net/sunrpc/auth_unix.c
@@ -131,8 +131,7 @@ unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags)
         for (i = 0; i < groups ; i++)
                 if (!gid_eq(cred->uc_gids[i], GROUP_AT(acred->group_info, i)))
                         return 0;
-        if (groups < NFS_NGROUPS &&
-            cred->uc_gids[groups] != INVALID_GID)
+        if (groups < NFS_NGROUPS && gid_valid(cred->uc_gids[groups]))
                 return 0;
         return 1;
 }
@@ -161,7 +160,7 @@ unx_marshal(struct rpc_task *task, __be32 *p)
         *p++ = htonl((u32) cred->uc_uid);
         *p++ = htonl((u32) cred->uc_gid);
         hold = p++;
-        for (i = 0; i < 16 && cred->uc_gids[i] != INVALID_GID; i++)
+        for (i = 0; i < 16 && gid_valid(cred->uc_gids[i]); i++)
                 *p++ = htonl((u32) cred->uc_gids[i]);
         *hold = htonl(p - hold - 1);            /* gid array length */
         *base = htonl((p - base - 1) << 2);     /* cred length */