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Date:   Sat,  9 Mar 2019 01:14:24 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Jacopo Mondi <jacopo@...ndi.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] media: renesas-ceu: fix a potential NULL pointer dereference

In case of_match_device cannot find a match, the check returns
-EINVAL to avoid a potential NULL pointer dereference

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/media/platform/renesas-ceu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/renesas-ceu.c b/drivers/media/platform/renesas-ceu.c
index 150196f7cf96..4aa807c0b6c7 100644
--- a/drivers/media/platform/renesas-ceu.c
+++ b/drivers/media/platform/renesas-ceu.c
@@ -1682,7 +1682,10 @@ static int ceu_probe(struct platform_device *pdev)
 
 	if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
 		ceu_data = of_match_device(ceu_of_match, dev)->data;
-		num_subdevs = ceu_parse_dt(ceudev);
+		if (unlikely(!ceu_data))
+			num_subdevs = -EINVAL;
+		else
+			num_subdevs = ceu_parse_dt(ceudev);
 	} else if (dev->platform_data) {
 		/* Assume SH4 if booting with platform data. */
 		ceu_data = &ceu_data_sh4;
-- 
2.17.1

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