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>

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 8245d3b348946bb6755a45b0ada5a5b84ae50dcd..0bd05ab26003c49f5ecfb349641754a3dc568408 100644 (file)
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -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;