crypto: ccree - use the full crypt length value

commit 7a4be6c1 upstream.

In case of AEAD decryption verifcation error we were using the
wrong value to zero out the plaintext buffer leaving the end of
the buffer with the false plaintext.
Signed-off-by: NGilad Ben-Yossef <gilad@benyossef.com>
Fixes: ff27e85a ("crypto: ccree - add AEAD support")
CC: stable@vger.kernel.org # v4.17+
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/crypto/ccree/cc_aead.c

@@ -227,7 +227,7 @@ static void cc_aead_complete(struct device *dev, void *cc_req, int err)
 			/* In case of payload authentication failure, MUST NOT
 			 * revealed the decrypted message --> zero its memory.
 			 */
-			cc_zero_sgl(areq->dst, areq_ctx->cryptlen);
+			cc_zero_sgl(areq->dst, areq->cryptlen);
 			err = -EBADMSG;
 		}
 	} else { /*ENCRYPT*/