The lpuart_ports[] array is indexed using a value derived from the
"serialN" alias in DT, which may lead to an out-of-bounds access.
Fix this by adding a range check.
Fixes: 970416c691dc68b5 ("serial: fsl_lpuart: Fix out-of-bounds access through DT alias")
Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
---
drivers/tty/serial/fsl_lpuart.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 8cf112f2efc30707..5218e2ed1ba90a5b 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2145,6 +2145,10 @@ static int lpuart_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
return ret;
}
+ if (ret >= UART_NR) {
+ dev_err(&pdev->dev, "serial%d out of range\n", ret);
+ return -EINVAL;
+ }
sport->port.line = ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
--
2.7.4
