The serial_pxa_ports[] 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: 699c20f3e6310aa2 ("serial: pxa: add OF support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
v2:
- Fix Fixes reference,
- Fix off-by-one error (use ">="),
- Update patch description for platform data.
---
drivers/tty/serial/pxa.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index baf552944d5686e8..eda3c7710d6a745f 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -885,6 +885,10 @@ static int serial_pxa_probe(struct platform_device *dev)
sport->port.line = dev->id;
else if (ret < 0)
goto err_clk;
+ if (sport->port.line >= ARRAY_SIZE(serial_pxa_ports)) {
+ dev_err(&dev->dev, "serial%d out of range\n", sport->port.line);
+ return -EINVAL;
+ }
snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1);
sport->port.membase = ioremap(mmres->start, resource_size(mmres));
--
2.7.4
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