I use a wrong commit id, please ignore this patch.
On 2022/5/16 22:10, Yang Yingliang wrote:
commit 7c25a0b89a487878b0691e6524fb5a8827322194 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@xxxxxxxxxx>
Reviewed-by: Baruch Siach <baruch@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220505124621.1592697-1-yangyingliang@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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(-)
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)
