linux-kernel - [PATCH 5.10 28/49] usb: cdns3: fix NULL pointer dereference on no platform data

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Date:   Wed, 10 Mar 2021 14:23:39 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nishanth Menon <nm@...com>,
        Roger Quadros <rogerq@...com>,
        Pawel Laszczak <pawell@...ence.com>,
        Peter Chen <peter.chen@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 28/49] usb: cdns3: fix NULL pointer dereference on no platform data

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Roger Quadros <rogerq@...com>

[ Upstream commit 448373d9db1a7000072f65103af19e20503f0c0c ]

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: 7cea9657756b ("usb: cdns3: add quirk for enable runtime pm by default")
Reported-by: Nishanth Menon <nm@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
Acked-by: Pawel Laszczak <pawell@...ence.com>
Signed-off-by: Peter Chen <peter.chen@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 29affbf1e828..6eeb7ed8e91f 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -569,7 +569,7 @@ 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 c3b29a9c77a5..102977790d60 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,
-- 
2.30.1