linux-kernel - [PATCH] kernfs: fix off by one error.

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Date:	Wed,  5 Mar 2014 17:10:52 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Tejun Heo <tj@...nel.org>, <stable@...r.kernel.org>
Subject: [PATCH] kernfs: fix off by one error.

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>
Cc: <stable@...r.kernel.org>
---
 fs/kernfs/dir.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index bd6e18b..39c0143 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -37,7 +37,7 @@ static unsigned int kernfs_name_hash(const char *name, const void *ns)
 	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;
-- 
1.7.10.4

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