linux-kernel - [PATCH] usb: cdns3: fix NULL pointer dereference on no platform data

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Date:   Mon, 23 Nov 2020 12:49:31 +0200
From:   Roger Quadros <rogerq@...com>
To:     <peter.chen@....com>, <pawell@...ence.com>
CC:     <balbi@...nel.org>, <nm@...com>, <nsekhar@...com>,
        <a-govindraju@...com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>
Subject: [PATCH] usb: cdns3: fix NULL pointer dereference on no platform data

Some platforms (e.g. TI) will not have any platform data which will
lead to NULL pointer dereference if we don't check for NULL pdata.

Fixes: a284b7fd1b8f ("usb: cdns3: add quirk for enable runtime pm by default")
Reported-by: Nishanth Menon <nm@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/cdns3/core.c | 2 +-
 drivers/usb/cdns3/host.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index 54d841aa626f..0f08aebce86d 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -559,7 +559,7 @@ static int cdns3_probe(struct platform_device *pdev)
 	device_set_wakeup_capable(dev, true);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
-	if (!(cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
+	if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
 		pm_runtime_forbid(dev);
 
 	/*
diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
index 08103785a17a..ec89f2e5430f 100644
--- a/drivers/usb/cdns3/host.c
+++ b/drivers/usb/cdns3/host.c
@@ -59,7 +59,7 @@ static int __cdns3_host_init(struct cdns3 *cdns)
 		goto err1;
 	}
 
-	if (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)
+	if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
 		cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
 
 	ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
-- 
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