crypto: virtio/akcipher - Fix stack overflow on memcpy

sizeof(struct virtio_crypto_akcipher_session_para) is less than
sizeof(struct virtio_crypto_op_ctrl_req::u), copying more bytes from
stack variable leads stack overflow. Clang reports this issue by
commands:
make -j CC=clang-14 mrproper >/dev/null 2>&1
make -j O=/tmp/crypto-build CC=clang-14 allmodconfig >/dev/null 2>&1
make -j O=/tmp/crypto-build W=1 CC=clang-14 drivers/crypto/virtio/
virtio_crypto_akcipher_algs.o

Fixes: 59ca6c93387d ("virtio-crypto: implement RSA algorithm")
Link: https://lore.kernel.org/all/[e-mail]/
Cc: <[e-mail]>
Signed-off-by: zhenwei pi <[e-mail]>
Tested-by: Nathan Chancellor <[e-mail]> # build
Acked-by: Michael S. Tsirkin <[e-mail]>
Acked-by: Jason Wang <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/virtio/virtio_crypto_akcipher_algs.c

···
 }
 
 static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher_ctx *ctx,
-		struct virtio_crypto_ctrl_header *header, void *para,
+		struct virtio_crypto_ctrl_header *header,
+		struct virtio_crypto_akcipher_session_para *para,
 		const uint8_t *key, unsigned int keylen)
 {
 	struct scatterlist outhdr_sg, key_sg, inhdr_sg, *sgs[3];
···
 
 	ctrl = &vc_ctrl_req->ctrl;
 	memcpy(&ctrl->header, header, sizeof(ctrl->header));
-	memcpy(&ctrl->u, para, sizeof(ctrl->u));
+	memcpy(&ctrl->u.akcipher_create_session.para, para, sizeof(*para));
 	input = &vc_ctrl_req->input;
 	input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);