linux-kernel - [PATCH] libnvdimm/of_pmem: Add check and kfree for kstrdup

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Message-Id: <20230619033623.11044-1-jiasheng@iscas.ac.cn>
Date:   Mon, 19 Jun 2023 11:36:23 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, ira.weiny@...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] libnvdimm/of_pmem: Add check and kfree for kstrdup

Add check for the return value of kstrdup() and return the error
if it fails in order to avoid NULL pointer dereference.
Moreover, use kfree() in the later error handling in order to avoid
memory leak.

Fixes: 49bddc73d15c ("libnvdimm/of_pmem: Provide a unique name for bus provider")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/nvdimm/of_pmem.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
index 10dbdcdfb9ce..fe6edb7e6631 100644
--- a/drivers/nvdimm/of_pmem.c
+++ b/drivers/nvdimm/of_pmem.c
@@ -31,11 +31,17 @@ static int of_pmem_region_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	priv->bus_desc.provider_name = kstrdup(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;
 
 	priv->bus = bus = nvdimm_bus_register(&pdev->dev, &priv->bus_desc);
 	if (!bus) {
+		kfree(priv->bus_desc.provider_name);
 		kfree(priv);
 		return -ENODEV;
 	}
-- 
2.25.1