[PATCH 2/3] bus: imx-weim: reject devices without match data

[Jiale Yao <yaojiale02@163.com>]

Platform driver_override can bind a device to this driver without a
matching OF entry. In that case, device_get_match_data() returns NULL
and weim_parse_dt() dereferences it while configuring the controller.

Reject devices without match data before parsing the device tree.

Fixes: 85bf6d4e4b10 ("drivers: bus: add a new driver for WEIM")
Cc: stable@vger.kernel.org
Signed-off-by: Jiale Yao <yaojiale02@163.com>
---
 drivers/bus/imx-weim.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c
index 87070155b057..3ecad0e453cc 100644
--- a/drivers/bus/imx-weim.c
+++ b/drivers/bus/imx-weim.c
@@ -205,13 +205,17 @@ static int weim_timing_setup(struct device *dev, struct device_node *np,
 
 static int weim_parse_dt(struct platform_device *pdev)
 {
-	const struct imx_weim_devtype *devtype = device_get_match_data(&pdev->dev);
+	const struct imx_weim_devtype *devtype;
 	int ret = 0, have_child = 0;
 	struct device_node *child;
 	struct weim_priv *priv;
 	void __iomem *base;
 	u32 reg;
 
+	devtype = device_get_match_data(&pdev->dev);
+	if (!devtype)
+		return -ENODATA;
+
 	if (devtype == &imx50_weim_devtype) {
 		ret = imx_weim_gpr_setup(pdev);
 		if (ret)
-- 
2.34.1