commit 456bee98 upstream.

The IV must not be modified by the skcipher operation so we need
to duplicate it.

Fixes: c3917fd9 ("KEYS: Use skcipher")
Reported-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>