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serial: imx: Fix out-of-bounds access through serial port index 

The imx_ports[] 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: ff05967a07 ("serial/imx: add of_alias_get_id() reference back")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2018-02-23 14:38:31 +01:00 committed by Greg Kroah-Hartman
parent ffab87fdec
commit 5673444821
1 changed files with 6 additions and 0 deletions
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6
drivers/tty/serial/imx.c
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@ -2069,6 +2069,12 @@ static int serial_imx_probe(struct platform_device *pdev)
else if (ret < 0)
return ret;
if (sport->port.line >= ARRAY_SIZE(imx_ports)) {
dev_err(&pdev->dev, "serial%d out of range\n",
sport->port.line);
return -EINVAL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))