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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@gmail.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Richard Cochran 2014-03-05 17:10:52 +01:00 committed by Greg Kroah-Hartman
parent 13df797743
commit 88391d49ab
1 changed files with 1 additions and 1 deletions
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2
fs/kernfs/dir.c
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@ -190,7 +190,7 @@ 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;