linux-kernel - [PATCH review 74/85] cifs: Use BUILD_BUG_ON to validate uids and gids are the same size

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Date:	Wed, 13 Feb 2013 09:52:03 -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>,
	Steve French <smfrench@...il.com>
Subject: [PATCH review 74/85] cifs: Use BUILD_BUG_ON to validate uids and gids are the same size

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

The assumption that sizeof(uid_t) is the same as sizeof(gid_t) is
completely reasonable but since we can verify the condition at
compile time.

Cc: Steve French <smfrench@...il.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 fs/cifs/cifsacl.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 5cbd00e..2e811f4 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -297,6 +297,7 @@ sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid,
 	 * probably a safe assumption but might be better to check based on
 	 * sidtype.
 	 */
+	BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t));
 	if (sidkey->datalen != sizeof(uid_t)) {
 		rc = -EIO;
 		cFYI(1, "%s: Downcall contained malformed key "
-- 
1.7.5.4

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