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: c9e2e946fb0ba5d2 ("tty: serial: add Freescale lpuart driver support")
Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
---
v2:
  - Fix Fixes reference,
  - Use ARRAY_SIZE().
---
 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..51e47a63d61accef 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 >= ARRAY_SIZE(lpuart_ports)) {
+               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

Reply via email to