diff --git a/crypto/akcipher.c b/crypto/akcipher.c
index 8ffd31c44cf6..e9b6ddcdf124 100644
--- a/crypto/akcipher.c
+++ b/crypto/akcipher.c
@@ -192,12 +192,17 @@ EXPORT_SYMBOL_GPL(akcipher_register_instance);
 int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
 {
 	unsigned int reqsize = crypto_akcipher_reqsize(data->tfm);
-	unsigned int mlen = max(data->slen, data->dlen);
 	struct akcipher_request *req;
 	struct scatterlist *sg;
+	unsigned int mlen;
 	unsigned int len;
 	u8 *buf;
 
+	if (data->dst)
+		mlen = max(data->slen, data->dlen);
+	else
+		mlen = data->slen + data->dlen;
+
 	len = sizeof(*req) + reqsize + mlen;
 	if (len < mlen)
 		return -EOVERFLOW;
@@ -213,9 +218,10 @@ int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
 	data->buf = buf;
 	memcpy(buf, data->src, data->slen);
 
-	sg = data->sg;
+	sg = &data->sg;
 	sg_init_one(sg, buf, mlen);
-	akcipher_request_set_crypt(req, sg, sg, data->slen, data->dlen);
+	akcipher_request_set_crypt(req, sg, data->dst ? sg : NULL,
+				   data->slen, data->dlen);
 
 	crypto_init_wait(&data->cwait);
 	akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
diff --git a/crypto/internal.h b/crypto/internal.h
index e3cf5a658d51..63e59240d5fb 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -44,7 +44,7 @@ struct crypto_akcipher_sync_data {
 
 	struct akcipher_request *req;
 	struct crypto_wait cwait;
-	struct scatterlist sg[2];
+	struct scatterlist sg;
 	u8 *buf;
 };
 
diff --git a/crypto/sig.c b/crypto/sig.c
index d812555c88af..b48c18ec65cd 100644
--- a/crypto/sig.c
+++ b/crypto/sig.c
@@ -128,9 +128,7 @@ int crypto_sig_verify(struct crypto_sig *tfm,
 	if (err)
 		return err;
 
-	sg_init_table(data.sg, 2);
-	sg_set_buf(&data.sg[0], src, slen);
-	sg_set_buf(&data.sg[1], digest, dlen);
+	memcpy(data.buf + slen, digest, dlen);
 
 	return crypto_akcipher_sync_post(&data,
 					 crypto_akcipher_verify(data.req));