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

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Date:   Mon, 30 Jan 2017 10:36:29 +0530
From:   Shailendra Verma <shailendra.v@...sung.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Warren <swarren@...dotorg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>,
        linux-usb@...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] Usb: host - 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/usb/host/xhci-tegra.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index a59fafb..890c778 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -903,6 +903,10 @@ static int tegra_xusb_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	tegra->soc = of_device_get_match_data(&pdev->dev);
+	if (!tegra->soc) {
+		dev_err(&pdev->dev, "no device match found\n");
+		return -ENODEV;
+	}
 	mutex_init(&tegra->lock);
 	tegra->dev = &pdev->dev;
 
-- 
1.7.9.5