linux-kernel - [PATCH] Mtd: nand - Fix possible NULL derefrence.

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Date:   Mon, 30 Jan 2017 10:29:17 +0530
From:   Shailendra Verma <shailendra.v@...sung.com>
To:     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@...el.com>,
        Stefan Agner <stefan@...er.ch>, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, p.shailesh@...sung.com,
        ashish.kalra@...sung.com,
        Shailendra Verma <shailendra.v@...sung.com>,
        Shailendra Verma <shailendra.capricorn@...il.com>
Subject: [PATCH] Mtd: nand - Fix possible NULL derefrence.

of_match_device could return NULL, and so can cause a NULL
pointer dereference later.

Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
---
 drivers/mtd/nand/mxc_nand.c  |    4 ++++
 drivers/mtd/nand/vf610_nfc.c |    4 ++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index d7f724b..ca1b8ad 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -1596,6 +1596,10 @@ static int __init mxcnd_probe_dt(struct mxc_nand_host *host)
 	if (!np)
 		return 1;
 
+	if (!of_id) {
+		dev_err(host->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
 	host->devtype_data = of_id->data;
 
 	return 0;
diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
index 3ad514c..0e09c11 100644
--- a/drivers/mtd/nand/vf610_nfc.c
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -674,6 +674,10 @@ 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, "Error: No device match found\n");
+		return -ENODEV;
+	}
 	nfc->variant = (enum vf610_nfc_variant)of_id->data;
 
 	for_each_available_child_of_node(nfc->dev->of_node, child) {
-- 
1.7.9.5