From: lei he <helei.si...@bytedance.com>
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 <m...@redhat.com>
Cc: Jason Wang <jasow...@redhat.com>
Cc: Gonglei <arei.gong...@huawei.com>
Reviewed-by: Gonglei <arei.gong...@huawei.com>
Signed-off-by: lei he <helei.si...@bytedance.com>
Signed-off-by: zhenwei pi <pizhen...@bytedance.com>
---
drivers/crypto/virtio/virtio_crypto_akcipher_algs.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
index 382ccec9ab12..2a60d0525cde 100644
--- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
@@ -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);
}
--
2.20.1
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