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 dd345a31bfdec350d2593e6de5964e55c7f19c76 ]
The auart_port[] 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: 1ea6607d4cdc9179 ("serial: mxs-auart: Allow device tree probing") 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/mxs-auart.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -1664,6 +1664,10 @@ static int mxs_auart_probe(struct platfo s->port.line = pdev->id < 0 ? 0 : pdev->id; else if (ret < 0) return ret; + if (s->port.line >= ARRAY_SIZE(auart_port)) { + dev_err(&pdev->dev, "serial%d out of range\n", s->port.line); + return -EINVAL; + }
if (of_id) { pdev->id_entry = of_id->data;