[PATCH can 2/4] can: flexcan: flexcan_probe(): fix probing for m68k/coldfire and reject devices without match data

[Marc Kleine-Budde <mkl@pengutronix.de>]

When determining the device details was reworked in commit 5e6c3454b405
("net: can: Use device_get_match_data()") there was no replacement for the
previous handling of non-of instantiated devices via the device's id_entry
which then results in a NULL pointer exception. The only in-tree provider
of such a device is arch/m68k/coldfire/device.c.

Restore retrieving the devtype_data via platform_get_device_id().

Also a device bound through driver_override need not match an entry in
of_match_table or id_table. In that case device_get_match_data() returns
NULL, but flexcan_probe() dereferences the result.

Reject devices without match data before continuing probe.

Fixes: 5e6c3454b405 ("net: can: Use device_get_match_data()")
Cc: stable@vger.kernel.org
Reported-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Closes: https://lore.kernel.org/all/20260618140147.142489-2-u.kleine-koenig@baylibre.com/
Reported-by: Marc Kleine-Budde <mkl@pengutronix.de>
Closes: https://lore.kernel.org/all/20260528-fluorescent-sage-ladybug-43261b-mkl@pengutronix.de/
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/flexcan/flexcan-core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
index 86b40abe9e76..2bb9e4184eb5 100644
--- a/drivers/net/can/flexcan/flexcan-core.c
+++ b/drivers/net/can/flexcan/flexcan-core.c
@@ -2148,6 +2148,11 @@ static int flexcan_probe(struct platform_device *pdev)
 		return PTR_ERR(regs);
 
 	devtype_data = device_get_match_data(&pdev->dev);
+	if (!devtype_data && platform_get_device_id(pdev))
+		devtype_data = (struct flexcan_devtype_data *)
+			platform_get_device_id(pdev)->driver_data;
+	if (!devtype_data)
+		return -ENODEV;
 
 	if ((devtype_data->quirks & FLEXCAN_QUIRK_SUPPORT_FD) &&
 	    !((devtype_data->quirks &

-- 
2.53.0