linux-kernel - [RFT PATCH 2/3] slimbus: qcom-ngd: fix kfree() of const memory on setting driver

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Message-Id: <20220222132707.266883-3-krzysztof.kozlowski@canonical.com>
Date:   Tue, 22 Feb 2022 14:27:06 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Abel Vesa <abel.vesa@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        stable@...r.kernel.org
Subject: [RFT PATCH 2/3] slimbus: qcom-ngd: fix kfree() of const memory on setting driver_override

The driver_override field from platform driver should not be initialized
from const memory because the core later kfree() it, for example when
driver_override is set via sysfs.

Fixes: 917809e2280b ("slimbus: ngd: Add qcom SLIMBus NGD driver")
Cc: <stable@...r.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 7040293c2ee8..5987d8f8a8fd 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1455,7 +1455,14 @@ static int of_qcom_slim_ngd_register(struct device *parent,
 		}
 		ngd->id = id;
 		ngd->pdev->dev.parent = parent;
-		ngd->pdev->driver_override = QCOM_SLIM_NGD_DRV_NAME;
+		ngd->pdev->driver_override = kstrdup(QCOM_SLIM_NGD_DRV_NAME,
+						     GFP_KERNEL);
+		if (!ngd->pdev->driver_override) {
+			platform_device_put(ngd->pdev);
+			kfree(ngd);
+			of_node_put(node);
+			return -ENOMEM;
+		}
 		ngd->pdev->dev.of_node = node;
 		ctrl->ngd = ngd;
 
-- 
2.32.0