linux-kernel - [PATCH review 47/85] sunrpc: Use gid_valid to test for gid != INVALID

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Date:	Wed, 13 Feb 2013 09:51:36 -0800
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	<linux-fsdevel@...r.kernel.org>
Cc:	Linux Containers <containers@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: [PATCH review 47/85] sunrpc: Use gid_valid to test for gid != INVALID_GID

From: "Eric W. Biederman" <ebiederm@...ssion.com>

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@...ldses.org>
Cc: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 net/sunrpc/auth_unix.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
index 55b6ca6..c434fde 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 */
-- 
1.7.5.4

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