ASoC: SOF: ipc-msg-injector: fix copy in sof_msg_inject_ipc4_dfs_write()

There are two bugs that have to do with when we copy the payload:

size = simple_write_to_buffer(ipc4_msg->data_ptr,
priv->max_msg_size, ppos, buffer,
count);

The value of "*ppos" was supposed to be zero but it is
sizeof(ipc4_msg->header_u64) so it will copy the data into the middle of
the "ipc4_msg->data_ptr" buffer instead of to the start. The second
problem is "buffer" should be "buffer + sizeof(ipc4_msg->header_u64)".

This function is used for fuzz testing so the data is normally random
and this bug likely does not affect anyone very much.

In this context, it's simpler and more appropriate to use copy_from_user()
instead of simple_write_to_buffer() so I have re-written the function.

Fixes: 066c67624d8c ("ASoC: SOF: ipc-msg-injector: Add support for IPC4 messages")
Signed-off-by: Dan Carpenter <[e-mail]>
Link: https://lore.kernel.org/r/Ysg1tB2FKLnRMsel@kili
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/sof/sof-client-ipc-msg-injector.c

···
 	struct sof_client_dev *cdev = file->private_data;
 	struct sof_msg_inject_priv *priv = cdev->data;
 	struct sof_ipc4_msg *ipc4_msg = priv->tx_buffer;
-	ssize_t size;
+	size_t data_size;
 	int ret;
 
 	if (*ppos)
···
 		return -EINVAL;
 
 	/* copy the header first */
-	size = simple_write_to_buffer(&ipc4_msg->header_u64,
-				      sizeof(ipc4_msg->header_u64),
-				      ppos, buffer, count);
-	if (size < 0)
-		return size;
-	if (size != sizeof(ipc4_msg->header_u64))
+	if (copy_from_user(&ipc4_msg->header_u64, buffer,
+			   sizeof(ipc4_msg->header_u64)))
 		return -EFAULT;
 
-	count -= size;
+	data_size = count - sizeof(ipc4_msg->header_u64);
+	if (data_size > priv->max_msg_size)
+		return -EINVAL;
+
 	/* Copy the payload */
-	size = simple_write_to_buffer(ipc4_msg->data_ptr,
-				      priv->max_msg_size, ppos, buffer,
-				      count);
-	if (size < 0)
-		return size;
-	if (size != count)
+	if (copy_from_user(ipc4_msg->data_ptr,
+			   buffer + sizeof(ipc4_msg->header_u64), data_size))
 		return -EFAULT;
 
-	ipc4_msg->data_size = count;
+	ipc4_msg->data_size = data_size;
 
 	/* Initialize the reply storage */
 	ipc4_msg = priv->rx_buffer;
···
 
 	/* return the error code if test failed */
 	if (ret < 0)
-		size = ret;
+		return ret;
 
-	return size;
+	return count;
 };
 
 static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file)