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

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[ 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: ba44dc0430 ("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>
This commit is contained in:
Henry Martin 2025-04-03 15:03:39 +08:00 • committed by Greg Kroah-Hartman
commit a05ebe384c
1 changed files with 4 additions and 1 deletions
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5
drivers/tty/serial/milbeaut_usio.c
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@ -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;