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From:   Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>
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        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        stable@vger.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Subject: [PATCH v5 10/11] slimbus: qcom-ngd: Fix kfree() of static memory on setting driver_override
Date:   Wed, 16 Mar 2022 16:08:02 +0100
Message-Id: <20220316150803.421897-4-krzysztof.kozlowski@canonical.com>
In-Reply-To: <20220316150533.421349-1-krzysztof.kozlowski@canonical.com>
References: <20220316150533.421349-1-krzysztof.kozlowski@canonical.com>
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The driver_override field from platform driver should not be initialized
from static memory (string literal) because the core later kfree() it,
for example when driver_override is set via sysfs.

Use dedicated helper to set driver_override properly.

Fixes: 917809e2280b ("slimbus: ngd: Add qcom SLIMBus NGD driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 0f29a08b4c09..0aa8408464ad 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1434,6 +1434,7 @@ static int of_qcom_slim_ngd_register(struct device *parent,
 	const struct of_device_id *match;
 	struct device_node *node;
 	u32 id;
+	int ret;
 
 	match = of_match_node(qcom_slim_ngd_dt_match, parent->of_node);
 	data = match->data;
@@ -1455,7 +1456,17 @@ 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;
+
+		ret = driver_set_override(&ngd->pdev->dev,
+					  &ngd->pdev->driver_override,
+					  QCOM_SLIM_NGD_DRV_NAME,
+					  strlen(QCOM_SLIM_NGD_DRV_NAME));
+		if (ret) {
+			platform_device_put(ngd->pdev);
+			kfree(ngd);
+			of_node_put(node);
+			return ret;
+		}
 		ngd->pdev->dev.of_node = node;
 		ctrl->ngd = ngd;
 
-- 
2.32.0