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Subject[PATCH 4.4 242/268] serial: fsl_lpuart: Fix out-of-bounds access through DT alias
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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
@@ -1818,6 +1818,10 @@ 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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