As the possible failure of the allocation, the devm_ioremap() may return
NULL pointer.
And the 'port->membase' will be directly used in mlb_usio_startup().
Therefore, in order to avoid the dereference of the NULL pointer, it
should be better to add the sanity check.
Fixes: ba44dc043004 ("serial: Add Milbeaut serial control")
Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
---
drivers/tty/serial/milbeaut_usio.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/tty/serial/milbeaut_usio.c b/drivers/tty/serial/milbeaut_usio.c
index 8f2cab7f66ad..1ecbf6d0dc79 100644
--- a/drivers/tty/serial/milbeaut_usio.c
+++ b/drivers/tty/serial/milbeaut_usio.c
@@ -523,6 +523,10 @@ static int mlb_usio_probe(struct platform_device *pdev)
}
port->membase = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
+ if (!port->membase) {
+ ret = -ENOMEM;
+ goto failed;
+ }
ret = platform_get_irq_byname(pdev, "rx");
mlb_usio_irq[index][RX] = ret;
--
2.25.1
