| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 239/268] serial: samsung: Fix out-of-bounds access through serial port index | Date | Mon, 28 May 2018 12:03:33 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Geert Uytterhoeven <geert+renesas@glider.be>
[ Upstream commit 49ee23b71877831ac087d6083f6f397dc19c9664 ]
The s3c24xx_serial_ports[] array is indexed using a value derived from the "serialN" alias in DT, or from an incrementing probe index, which may lead to an out-of-bounds access.
Fix this by adding a range check.
Note that the array size is defined by a Kconfig symbol (CONFIG_SERIAL_SAMSUNG_UARTS), so this can even be triggered using a legitimate DTB or legitimate board code.
Fixes: 13a9f6c64fdc55eb ("serial: samsung: Consider DT alias when probing ports") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/tty/serial/samsung.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1807,6 +1807,10 @@ static int s3c24xx_serial_probe(struct p dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index); + if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) { + dev_err(&pdev->dev, "serial%d out of range\n", index); + return -EINVAL; + } ourport = &s3c24xx_serial_ports[index]; ourport->drv_data = s3c24xx_get_driver_data(pdev);
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