linux-kernel - [PATCH v1 1/1] usb: dwc3: Fix NULL pointer exception in dwc3_pci

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Message-Id: <2972befa36441a5dea1de9efb1e1355f8406d7b6.1539801494.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Wed, 17 Oct 2018 11:40:26 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     balbi@...nel.org, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, stable@...r.kernel.org
Subject: [PATCH v1 1/1] usb: dwc3: Fix NULL pointer exception in dwc3_pci_remove()

In dwc3_pci_quirks() function, gpiod lookup table is only registered for
baytrail SOC. But in dwc3_pci_remove(), we try to unregistered it
without any checks. This leads to NULL pointer de-reference exception in
gpiod_remove_lookup_table() when unloading the module for non baytrail
SOCs. This patch fixes this issue.

Fixes: 5741022cbdf3 ("usb: dwc3: pci: Add GPIO lookup table on platforms
without ACPI GPIO resources")
Cc: <stable@...r.kernel.org>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/usb/dwc3/dwc3-pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index 1286076a8890..842795856bf4 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -283,8 +283,10 @@ static int dwc3_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 static void dwc3_pci_remove(struct pci_dev *pci)
 {
 	struct dwc3_pci		*dwc = pci_get_drvdata(pci);
+	struct pci_dev		*pdev = dwc->pci;
 
-	gpiod_remove_lookup_table(&platform_bytcr_gpios);
+	if (pdev->device == PCI_DEVICE_ID_INTEL_BYT)
+		gpiod_remove_lookup_table(&platform_bytcr_gpios);
 #ifdef CONFIG_PM
 	cancel_work_sync(&dwc->wakeup_work);
 #endif
-- 
2.7.4