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virtio-crypto: adjust dst_len at ops callback

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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 <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Gonglei <[email protected]>
Reviewed-by: Gonglei <[email protected]>
Signed-off-by: lei he <[email protected]>
Signed-off-by: zhenwei pi <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
This commit is contained in:
lei he authored and Michael S. Tsirkin committed 2022-05-31 12:45:09 -04:00
1 parent 977231e8d4
commit a36bd0ad9f
1 file changed
+4 -1
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drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+4 -1
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@@ -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);
}