linux-kernel - [PATCH v3] libnvdimm/of_pmem: Replace kstrdup with devm

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Message-Id: <20230706085839.31145-1-jiasheng@iscas.ac.cn>
Date:   Thu,  6 Jul 2023 16:58:39 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     ira.weiny@...el.com, dan.j.williams@...el.com,
        vishal.l.verma@...el.com, dave.jiang@...el.com, oohall@...il.com,
        aneesh.kumar@...ux.ibm.com
Cc:     nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v3] libnvdimm/of_pmem: Replace kstrdup with devm_kstrdup and add check

Replace kstrdup() with devm_kstrdup() to avoid memory leak and
add check for the return value of the devm_kstrdup() to avoid
NULL pointer dereference

Fixes: 49bddc73d15c ("libnvdimm/of_pmem: Provide a unique name for bus provider")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog:

v2 -> v3:

1. Correct the usage of devm_kstrdup().

v1 -> v2:

1. Replace kstrdup() with devm_kstrdup().
---
 drivers/nvdimm/of_pmem.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
index 10dbdcdfb9ce..1d2b1ab5b737 100644
--- a/drivers/nvdimm/of_pmem.c
+++ b/drivers/nvdimm/of_pmem.c
@@ -30,7 +30,12 @@ static int of_pmem_region_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	priv->bus_desc.provider_name = kstrdup(pdev->name, GFP_KERNEL);
+	priv->bus_desc.provider_name = devm_kstrdup(&pdev->dev, pdev->name, GFP_KERNEL);
+	if (!priv->bus_desc.provider_name) {
+		kfree(priv);
+		return -ENOMEM;
+	}
+
 	priv->bus_desc.module = THIS_MODULE;
 	priv->bus_desc.of_node = np;
 
-- 
2.25.1