linux-kernel - [RFT PATCH 1/3] clk: imx: scu: fix kfree() of const memory on setting driver

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Date:   Tue, 22 Feb 2022 14:27:05 +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 1/3] clk: imx: scu: 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: 77d8f3068c63 ("clk: imx: scu: add two cells binding support")
Cc: <stable@...r.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
---
 drivers/clk/imx/clk-scu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
index 083da31dc3ea..78ed40a0e3e2 100644
--- a/drivers/clk/imx/clk-scu.c
+++ b/drivers/clk/imx/clk-scu.c
@@ -683,7 +683,11 @@ struct clk_hw *imx_clk_scu_alloc_dev(const char *name,
 		return ERR_PTR(ret);
 	}
 
-	pdev->driver_override = "imx-scu-clk";
+	pdev->driver_override = kstrdup("imx-scu-clk", GFP_KERNEL);
+	if (!pdev->driver_override) {
+		platform_device_put(pdev);
+		return ERR_PTR(-ENOMEM);
+	}
 
 	ret = imx_clk_scu_attach_pd(&pdev->dev, rsrc_id);
 	if (ret)
-- 
2.32.0