linux-kernel - [PATCH AUTOSEL 4.19 055/244] slimbus: fix a potential NULL pointer dereference in of_qcom_slim_ngd

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Date:   Wed, 22 May 2019 15:23:21 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kangjie Lu <kjlu@....edu>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-arm-msm@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 055/244] slimbus: fix a potential NULL pointer dereference in of_qcom_slim_ngd_register

From: Kangjie Lu <kjlu@....edu>

[ Upstream commit 06d5d6b7f9948a89543e1160ef852d57892c750d ]

In case platform_device_alloc fails, the fix returns an error
code to avoid the NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 14a9d18306cbf..f63d1b8a09335 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1331,6 +1331,10 @@ static int of_qcom_slim_ngd_register(struct device *parent,
 			return -ENOMEM;
 
 		ngd->pdev = platform_device_alloc(QCOM_SLIM_NGD_DRV_NAME, id);
+		if (!ngd->pdev) {
+			kfree(ngd);
+			return -ENOMEM;
+		}
 		ngd->id = id;
 		ngd->pdev->dev.parent = parent;
 		ngd->pdev->driver_override = QCOM_SLIM_NGD_DRV_NAME;
-- 
2.20.1