linux-kernel - [PATCH 4.19 18/95] net: hso: fix muxed tty registration

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Date:   Mon,  4 Oct 2021 14:51:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 18/95] net: hso: fix muxed tty registration

From: Johan Hovold <johan@...nel.org>

commit e8f69b16ee776da88589b5271e3f46020efc8f6c upstream.

If resource allocation and registration fail for a muxed tty device
(e.g. if there are no more minor numbers) the driver should not try to
deregister the never-registered (or already-deregistered) tty.

Fix up the error handling to avoid dereferencing a NULL pointer when
attempting to remove the character device.

Fixes: 72dc1c096c70 ("HSO: add option hso driver")
Cc: stable@...r.kernel.org	# 2.6.27
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/usb/hso.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -2714,14 +2714,14 @@ struct hso_device *hso_create_mux_serial
 
 	serial = kzalloc(sizeof(*serial), GFP_KERNEL);
 	if (!serial)
-		goto exit;
+		goto err_free_dev;
 
 	hso_dev->port_data.dev_serial = serial;
 	serial->parent = hso_dev;
 
 	if (hso_serial_common_create
 	    (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
-		goto exit;
+		goto err_free_serial;
 
 	serial->tx_data_length--;
 	serial->write_data = hso_mux_serial_write_data;
@@ -2737,11 +2737,9 @@ struct hso_device *hso_create_mux_serial
 	/* done, return it */
 	return hso_dev;
 
-exit:
-	if (serial) {
-		tty_unregister_device(tty_drv, serial->minor);
-		kfree(serial);
-	}
+err_free_serial:
+	kfree(serial);
+err_free_dev:
 	kfree(hso_dev);
 	return NULL;