linux-kernel - [PATCH 3.14 10/33] kernfs: fix off by one error.

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Date:	Thu, 24 Apr 2014 14:48:23 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Richard Cochran <richardcochran@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 3.14 10/33] kernfs: fix off by one error.

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Cochran <richardcochran@...il.com>

commit 88391d49abb7d8dee91d405f96bd9e003cb6798d upstream.

The hash values 0 and 1 are reserved for magic directory entries, but
the code only prevents names hashing to 0. This patch fixes the test
to also prevent hash value 1.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/kernfs/dir.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -37,7 +37,7 @@ static unsigned int kernfs_name_hash(con
 	hash = (end_name_hash(hash) ^ hash_ptr((void *)ns, 31));
 	hash &= 0x7fffffffU;
 	/* Reserve hash numbers 0, 1 and INT_MAX for magic directory entries */
-	if (hash < 1)
+	if (hash < 2)
 		hash += 2;
 	if (hash >= INT_MAX)
 		hash = INT_MAX - 1;


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