[PATCH] pinctrl: mcp23s08: reject devices without match data

[Jiale Yao]

A device bound through driver_override need not match an entry in the
driver tables. In that case spi_get_device_match_data() returns NULL,
but mcp23s08_probe() later passes the result to the regmap setup and
dereferences it while setting up each device.

Reject devices without match data before reading device properties.

Fixes: 2e44555b05c0 ("pinctrl: mcp23s08: Simplify probe()/mcp23s08_spi_regmap_init()")
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/pinctrl/pinctrl-mcp23s08_spi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-mcp23s08_spi.c b/drivers/pinctrl/pinctrl-mcp23s08_spi.c
index bacebcff67ef..926034fcd512 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08_spi.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08_spi.c
@@ -146,6 +146,8 @@ static int mcp23s08_probe(struct spi_device *spi)
 	u8 v;
 
 	info = spi_get_device_match_data(spi);
+	if (!info)
+		return -ENODATA;
 
 	ret = device_property_read_u8(dev, "microchip,spi-present-mask", &v);
 	if (ret) {
-- 
2.34.1