From: Yang Yingliang Date: Thu, 5 May 2022 12:46:21 +0000 (+0800) Subject: tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart_probe() X-Git-Tag: v4.19.244~1 X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=6409b825d3fb236610e483724b613e1337c895ce;p=wrapfs-4.19.y.git tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart_probe() 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 Reviewed-by: Baruch Siach Cc: stable Link: https://lore.kernel.org/r/20220505124621.1592697-1-yangyingliang@huawei.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c index 13ac36e2da4f..4446c13629b1 100644 --- a/drivers/tty/serial/digicolor-usart.c +++ b/drivers/tty/serial/digicolor-usart.c @@ -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)