linux-kernel - [PATCH 4.9 19/19] tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart

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Message-Id: <20220516193614.070397081@linuxfoundation.org>
Date:   Mon, 16 May 2022 21:36:32 +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, Yang Yingliang <yangyingliang@...wei.com>,
        Baruch Siach <baruch@...s.co.il>
Subject: [PATCH 4.9 19/19] tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart_probe()

From: Yang Yingliang <yangyingliang@...wei.com>

commit 447ee1516f19f534a228dda237eddb202f23e163 upstream.

It will cause null-ptr-deref when using 'res', if platform_get_resource()
returns NULL, so move using 'res' after devm_ioremap_resource() that
will check it to avoid null-ptr-deref.
And use devm_platform_get_and_ioremap_resource() to simplify code.

Fixes: 5930cb3511df ("serial: driver for Conexant Digicolor USART")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Reviewed-by: Baruch Siach <baruch@...s.co.il>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20220505124621.1592697-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/serial/digicolor-usart.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/digicolor-usart.c
+++ b/drivers/tty/serial/digicolor-usart.c
@@ -476,10 +476,10 @@ static int digicolor_uart_probe(struct p
 		return PTR_ERR(uart_clk);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dp->port.mapbase = res->start;
 	dp->port.membase = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(dp->port.membase))
 		return PTR_ERR(dp->port.membase);
+	dp->port.mapbase = res->start;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)