linux-kernel - [PATCH] I2c: busses - Fix possible NULL derefrence.

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Date:   Mon, 30 Jan 2017 10:33:07 +0530
From:   Shailendra Verma <shailendra.v@...sung.com>
To:     Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Stephen Warren <swarren@...dotorg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>,
        linux-i2c@...r.kernel.org, linux-tegra@...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] I2c: busses - Fix possible NULL derefrence.

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

Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
---
 drivers/i2c/busses/i2c-tegra.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 4af9bba..93ac1e1 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -920,6 +920,10 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	tegra_i2c_parse_dt(i2c_dev);
 
 	i2c_dev->hw = of_device_get_match_data(&pdev->dev);
+	if (!i2c_dev->hw) {
+		dev_err(&pdev->dev, "no device match found\n");
+		return -ENODEV;
+	}
 	i2c_dev->is_dvc = of_device_is_compatible(pdev->dev.of_node,
 						  "nvidia,tegra20-i2c-dvc");
 	init_completion(&i2c_dev->msg_complete);
-- 
1.7.9.5