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

The serial_pxa_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: 699c20f3e6 ("serial: pxa: add OF support")
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 14:38:33 +01:00 committed by Greg Kroah-Hartman
parent dd345a31bf
commit afc7851fab
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/pxa.c
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@ -885,6 +885,10 @@ static int serial_pxa_probe(struct platform_device *dev)
sport->port.line = dev->id;
else if (ret < 0)
goto err_clk;
if (sport->port.line >= ARRAY_SIZE(serial_pxa_ports)) {
dev_err(&dev->dev, "serial%d out of range\n", sport->port.line);
return -EINVAL;
}
snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1);
sport->port.membase = ioremap(mmres->start, resource_size(mmres));