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tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart_probe()

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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: 5930cb3511 ("serial: driver for Conexant Digicolor USART")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Baruch Siach <baruch@tkos.co.il>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220505124621.1592697-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yang Yingliang 2022-05-05 20:46:21 +08:00 committed by Greg Kroah-Hartman
parent 0b8ef64073
commit 6409b825d3
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/digicolor-usart.c
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@ -472,10 +472,10 @@ static int digicolor_uart_probe(struct platform_device *pdev)
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)