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commit 6f0904ad

 upstream.

The output buffer length has to be at least as big as the key_size.
It is then updated to the actual output size by the implementation.
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>