linux-kernel - [PATCH 5.15 206/207] serial: liteuart: fix minor-number leak on probe errors

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Date:   Mon,  6 Dec 2021 15:57:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Filip Kokosinski <fkokosinski@...micro.com>,
        Mateusz Holenko <mholenko@...micro.com>,
        Stafford Horne <shorne@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 5.15 206/207] serial: liteuart: fix minor-number leak on probe errors

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

commit dd5e90b16cca8a697cbe17b72e2a5f49291cabb2 upstream.

Make sure to release the allocated minor number before returning on
probe errors.

Fixes: 1da81e5562fa ("drivers/tty/serial: add LiteUART driver")
Cc: stable@...r.kernel.org      # 5.11
Cc: Filip Kokosinski <fkokosinski@...micro.com>
Cc: Mateusz Holenko <mholenko@...micro.com>
Reviewed-by: Stafford Horne <shorne@...il.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Link: https://lore.kernel.org/r/20211117100512.5058-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/serial/liteuart.c |   17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

--- a/drivers/tty/serial/liteuart.c
+++ b/drivers/tty/serial/liteuart.c
@@ -270,8 +270,10 @@ static int liteuart_probe(struct platfor
 
 	/* get membase */
 	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
-	if (IS_ERR(port->membase))
-		return PTR_ERR(port->membase);
+	if (IS_ERR(port->membase)) {
+		ret = PTR_ERR(port->membase);
+		goto err_erase_id;
+	}
 
 	/* values not from device tree */
 	port->dev = &pdev->dev;
@@ -287,7 +289,16 @@ static int liteuart_probe(struct platfor
 
 	platform_set_drvdata(pdev, port);
 
-	return uart_add_one_port(&liteuart_driver, &uart->port);
+	ret = uart_add_one_port(&liteuart_driver, &uart->port);
+	if (ret)
+		goto err_erase_id;
+
+	return 0;
+
+err_erase_id:
+	xa_erase(&liteuart_array, uart->id);
+
+	return ret;
 }
 
 static int liteuart_remove(struct platform_device *pdev)