Commit a36bd0ad authored by lei he's avatar lei he Committed by Michael S. Tsirkin
Browse files

virtio-crypto: adjust dst_len at ops callback 



For some akcipher operations(eg, decryption of pkcs1pad(rsa)),
the length of returned result maybe less than akcipher_req->dst_len,
we need to recalculate the actual dst_len through the virt-queue
protocol.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: default avatarGonglei <arei.gonglei@huawei.com>
Signed-off-by: default avatarlei he <helei.sig11@bytedance.com>
Signed-off-by: default avatarzhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20220506131627.180784-5-pizhenwei@bytedance.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 977231e8

drivers/crypto/virtio/virtio_crypto_akcipher_algs.c

+4 −1
Original line number Diff line number Diff line
@@ -90,9 +90,12 @@ static void virtio_crypto_dataq_akcipher_callback(struct virtio_crypto_request * 
	}



	akcipher_req = vc_akcipher_req->akcipher_req;

	if (vc_akcipher_req->opcode != VIRTIO_CRYPTO_AKCIPHER_VERIFY)

	if (vc_akcipher_req->opcode != VIRTIO_CRYPTO_AKCIPHER_VERIFY) {

		/* actuall length maybe less than dst buffer */

		akcipher_req->dst_len = len - sizeof(vc_req->status);

		sg_copy_from_buffer(akcipher_req->dst, sg_nents(akcipher_req->dst),

				    vc_akcipher_req->dst_buf, akcipher_req->dst_len);

	}

	virtio_crypto_akcipher_finalize_req(vc_akcipher_req, akcipher_req, error);

}