Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 91/96] serial: fsl_lpuart: Fix out-of-bounds access through DT alias | Date | Thu, 24 May 2018 11:39:14 +0200 |
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4.9-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 ffab87fdecc655cc676f8be8dd1a2c5e22bd6d47 ]
The lpuart_ports[] array is indexed using a value derived from the "serialN" alias in DT, which may lead to an out-of-bounds access.
Fix this by adding a range check.
Fixes: c9e2e946fb0ba5d2 ("tty: serial: add Freescale lpuart driver support") 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/fsl_lpuart.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1902,6 +1902,10 @@ static int lpuart_probe(struct platform_ dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); return ret; } + if (ret >= ARRAY_SIZE(lpuart_ports)) { + dev_err(&pdev->dev, "serial%d out of range\n", ret); + return -EINVAL; + } sport->port.line = ret; sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart");
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