linux-kernel - [PATCH 4.4 017/138] Bluetooth: hci_intel: Fix null gpio desc pointer dereference

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Date:	Thu, 18 Aug 2016 15:57:07 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Loic Poulain <loic.poulain@...el.com>,
	Marcel Holtmann <marcel@...tmann.org>
Subject: [PATCH 4.4 017/138] Bluetooth: hci_intel: Fix null gpio desc pointer dereference

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Loic Poulain <loic.poulain@...el.com>

commit 32b9ccbc3522811c0e483637b85ae25f5491296f upstream.

gpiod_get_optional can return either ERR_PTR or NULL pointer.
NULL case is not tested and then dereferenced later in desc_to_gpio.
Fix this by using non optional version which returns ERR_PTR in any
error case (this is not an optional gpio).
Use the same non optional version for the host-wake gpio.

Fixes: 765ea3abd116 ("Bluetooth: hci_intel: Retrieve host-wake IRQ")
Signed-off-by: Loic Poulain <loic.poulain@...el.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/bluetooth/hci_intel.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/bluetooth/hci_intel.c
+++ b/drivers/bluetooth/hci_intel.c
@@ -1234,8 +1234,7 @@ static int intel_probe(struct platform_d
 
 	idev->pdev = pdev;
 
-	idev->reset = devm_gpiod_get_optional(&pdev->dev, "reset",
-					      GPIOD_OUT_LOW);
+	idev->reset = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(idev->reset)) {
 		dev_err(&pdev->dev, "Unable to retrieve gpio\n");
 		return PTR_ERR(idev->reset);
@@ -1247,8 +1246,7 @@ static int intel_probe(struct platform_d
 
 		dev_err(&pdev->dev, "No IRQ, falling back to gpio-irq\n");
 
-		host_wake = devm_gpiod_get_optional(&pdev->dev, "host-wake",
-						    GPIOD_IN);
+		host_wake = devm_gpiod_get(&pdev->dev, "host-wake", GPIOD_IN);
 		if (IS_ERR(host_wake)) {
 			dev_err(&pdev->dev, "Unable to retrieve IRQ\n");
 			goto no_irq;