linux-kernel - [PATCH] nvdimm: check for null return of devm_kmalloc in nd_pfn

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Date:   Sun, 26 Feb 2023 13:56:15 +0800
From:   Kang Chen <void0red@...il.com>
To:     dan.j.williams@...el.com
Cc:     vishal.l.verma@...el.com, dave.jiang@...el.com,
        ira.weiny@...el.com, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Kang Chen <void0red@...il.com>
Subject: [PATCH] nvdimm: check for null return of devm_kmalloc in nd_pfn_probe

devm_kmalloc may fails, pfn_sb might be null and will cause
null pointer dereference later.

Signed-off-by: Kang Chen <void0red@...il.com>
---
 drivers/nvdimm/pfn_devs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index af7d93015..d24fad175 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -640,6 +640,8 @@ int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
 	if (!pfn_dev)
 		return -ENOMEM;
 	pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
+	if (!pfn_sb)
+		return -ENOMEM;
 	nd_pfn = to_nd_pfn(pfn_dev);
 	nd_pfn->pfn_sb = pfn_sb;
 	rc = nd_pfn_validate(nd_pfn, PFN_SIG);
-- 
2.34.1