5.4-stable review patch. If anyone has any objections, please let me know.
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From: Henry Martin bsdhenrymartin@gmail.com
[ Upstream commit 86bcae88c9209e334b2f8c252f4cc66beb261886 ]
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: ba44dc043004 ("serial: Add Milbeaut serial control") Signed-off-by: Henry Martin bsdhenrymartin@gmail.com Link: https://lore.kernel.org/r/20250403070339.64990-1-bsdhenrymartin@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/tty/serial/milbeaut_usio.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/milbeaut_usio.c b/drivers/tty/serial/milbeaut_usio.c index 949ab7efc4fcd..e7ad13e2323f3 100644 --- a/drivers/tty/serial/milbeaut_usio.c +++ b/drivers/tty/serial/milbeaut_usio.c @@ -527,7 +527,10 @@ 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;