linux-kernel - [PATCH] mtd: nand: vf610_nfc: add NULL check on of_match

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Date:   Fri, 7 Jul 2017 01:59:26 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Stefan Agner <stefan@...er.ch>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] mtd: nand: vf610_nfc: add NULL check on of_match_device()
 return value

Check return value from call to of_match_device()
in order to prevent a NULL pointer dereference.

In case of NULL print error message and return -ENODEV

Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/mtd/nand/vf610_nfc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
index 744ab10..ca0ab96 100644
--- a/drivers/mtd/nand/vf610_nfc.c
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -674,6 +674,11 @@ static int vf610_nfc_probe(struct platform_device *pdev)
 	}
 
 	of_id = of_match_device(vf610_nfc_dt_ids, &pdev->dev);
+	if (!of_id) {
+		dev_err(&pdev->dev, "Failed to match device!\n");
+		return -ENODEV;
+	}
+
 	nfc->variant = (enum vf610_nfc_variant)of_id->data;
 
 	for_each_available_child_of_node(nfc->dev->of_node, child) {
-- 
2.5.0