| Message ID | 20220516141152.1549756-1-yangyingliang@huawei.com |
|---|---|
| State | New |
| Headers | show |
| Series | [4.9/4.14/4.19/5.4] tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart_probe() | expand |
diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c index 50ec5f1ac77f4..794864fac6250 100644 --- a/drivers/tty/serial/digicolor-usart.c +++ b/drivers/tty/serial/digicolor-usart.c @@ -476,10 +476,10 @@ 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)
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@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> --- v1: These stable versions don't have devm_platform_get_and_ioremap_resource(), so just move using 'res' after devm_ioremap_resource(). --- drivers/tty/serial/digicolor-usart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)