netdev - [PATCH] net: dsa: microchip: fix NULL pointer dereference on platform init

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Date: Mon,  4 Dec 2023 16:43:15 +0100
From: Daniel Danzberger <dd@...edd.com>
To: woojung.huh@...rochip.com,
	UNGLinuxDriver@...rochip.com
Cc: netdev@...r.kernel.org,
	Daniel Danzberger <dd@...edd.com>
Subject: [PATCH] net: dsa: microchip: fix NULL pointer dereference on platform init

Fixes a NULL pointer access when registering a switch device that has
not been defined via DTS.

This might happen when the switch is used on a platform like x86 that
doesn't use DTS and instantiates devices in platform specific init code.

Signed-off-by: Daniel Danzberger <dd@...edd.com>
---
 drivers/net/dsa/microchip/ksz_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 9545aed905f5..525e13d9e39c 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -1678,7 +1678,7 @@ static int ksz_check_device_id(struct ksz_device *dev)
 	dt_chip_data = of_device_get_match_data(dev->dev);
 
 	/* Check for Device Tree and Chip ID */
-	if (dt_chip_data->chip_id != dev->chip_id) {
+	if (dt_chip_data && dt_chip_data->chip_id != dev->chip_id) {
 		dev_err(dev->dev,
 			"Device tree specifies chip %s but found %s, please fix it!\n",
 			dt_chip_data->dev_name, dev->info->dev_name);
-- 
2.39.2