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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: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: lei he <helei.sig11@bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20220506131627.180784-5-pizhenwei@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
lei he 2022-05-06 21:16:26 +08:00 committed by Michael S. Tsirkin
parent 977231e8d4
commit a36bd0ad9f
1 changed files with 4 additions and 1 deletions
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5
drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
View File

@ -90,9 +90,12 @@ static void virtio_crypto_dataq_akcipher_callback(struct virtio_crypto_request *
} }
akcipher_req = vc_akcipher_req->akcipher_req; 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), sg_copy_from_buffer(akcipher_req->dst, sg_nents(akcipher_req->dst),
vc_akcipher_req->dst_buf, akcipher_req->dst_len); vc_akcipher_req->dst_buf, akcipher_req->dst_len);
}
virtio_crypto_akcipher_finalize_req(vc_akcipher_req, akcipher_req, error); virtio_crypto_akcipher_finalize_req(vc_akcipher_req, akcipher_req, error);
} }