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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2018-02-23 14:38:34 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-28 15:30:00 +0100 |
| commit | 49ee23b71877831ac087d6083f6f397dc19c9664 (patch) | |
| tree | 59d2823142a8f6c3367275f0ecc466ea6aae5442 /drivers/tty | |
| parent | serial: pxa: Fix out-of-bounds access through serial port index (diff) | |
| download | linux-49ee23b71877831ac087d6083f6f397dc19c9664.tar.xz linux-49ee23b71877831ac087d6083f6f397dc19c9664.zip | |
serial: samsung: Fix out-of-bounds access through serial port index
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/samsung.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index f9fecc5ed0ce..3f2f8c118ce0 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1818,6 +1818,10 @@ static int s3c24xx_serial_probe(struct platform_device *pdev) 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); |