diff --git a/drivers/crypto/atmel-sha204a.c b/drivers/crypto/atmel-sha204a.c
index dbb39ed0cea1..5699bb532325 100644
--- a/drivers/crypto/atmel-sha204a.c
+++ b/drivers/crypto/atmel-sha204a.c
@@ -48,8 +48,8 @@ static int atmel_sha204a_rng_read_nonblocking(struct hwrng *rng, void *data,
 
 	if (rng->priv) {
 		work_data = (struct atmel_i2c_work_data *)rng->priv;
-		max = min(sizeof(work_data->cmd.data), max);
-		memcpy(data, &work_data->cmd.data, max);
+		max = min(RANDOM_RSP_SIZE - CMD_OVERHEAD_SIZE, max);
+		memcpy(data, &work_data->cmd.data[RSP_DATA_IDX], max);
 		rng->priv = 0;
 	} else {
 		work_data = kmalloc_obj(*work_data, GFP_ATOMIC);
@@ -87,8 +87,8 @@ static int atmel_sha204a_rng_read(struct hwrng *rng, void *data, size_t max,
 	if (ret)
 		return ret;
 
-	max = min(sizeof(cmd.data), max);
-	memcpy(data, cmd.data, max);
+	max = min(RANDOM_RSP_SIZE - CMD_OVERHEAD_SIZE, max);
+	memcpy(data, &cmd.data[RSP_DATA_IDX], max);
 
 	return max;
 }