Commit 86bcae88 authored by Henry Martin's avatar Henry Martin Committed by Greg Kroah-Hartman
Browse files

serial: Fix potential null-ptr-deref in mlb_usio_probe() 



devm_ioremap() can return NULL on error. Currently, mlb_usio_probe()
does not check for this case, which could result in a NULL pointer
dereference.

Add NULL check after devm_ioremap() to prevent this issue.

Fixes: ba44dc04 ("serial: Add Milbeaut serial control")
Signed-off-by: default avatarHenry Martin <bsdhenrymartin@gmail.com>
Link: https://lore.kernel.org/r/20250403070339.64990-1-bsdhenrymartin@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 81e4de4b

drivers/tty/serial/milbeaut_usio.c

+4 −1
Original line number Diff line number Diff line
@@ -523,7 +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;