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serial: mxs-auart: Fix out-of-bounds access through serial port index

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The auart_port[] array is indexed using a value derived from the
"serialN" alias in DT, or from platform data, which may lead to an
out-of-bounds access.

Fix this by adding a range check.

Fixes: 1ea6607d4c ("serial: mxs-auart: Allow device tree probing")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2018-02-23 14:38:32 +01:00 committed by Greg Kroah-Hartman
parent 5673444821
commit dd345a31bf
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/mxs-auart.c
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@ -1663,6 +1663,10 @@ static int mxs_auart_probe(struct platform_device *pdev)
s->port.line = pdev->id < 0 ? 0 : pdev->id;
else if (ret < 0)
return ret;
if (s->port.line >= ARRAY_SIZE(auart_port)) {
dev_err(&pdev->dev, "serial%d out of range\n", s->port.line);
return -EINVAL;
}
if (of_id) {
pdev->id_entry = of_id->data;