linux-kernel - [PATCH] Mmc: host - Fix possible NULL derefrence.

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Message-id: <1485751698-29036-1-git-send-email-shailendra.v@samsung.com>
Date:   Mon, 30 Jan 2017 10:18:18 +0530
From:   Shailendra Verma <shailendra.v@...sung.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Marek Vasut <marex@...x.de>, linux-mmc@...r.kernel.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] Mmc: host - 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/mmc/host/mxs-mmc.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 44ecebd..d12a5b7 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -581,6 +581,11 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 	struct regulator *reg_vmmc;
 	struct mxs_ssp *ssp;
 
+	if (!of_id) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
+
 	irq_err = platform_get_irq(pdev, 0);
 	if (irq_err < 0)
 		return irq_err;
-- 
1.7.9.5