linux-kernel - [PATCH 2/2] soc: fsl: guts: Add a missing memory allocation failure check

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Message-Id: <4890990418ecbcfb8921efe8adb2019a03e5a1c1.1635969326.git.christophe.jaillet@wanadoo.fr>
Date:   Wed,  3 Nov 2021 21:00:33 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     leoyang.li@....com, tyreld@...ux.ibm.com
Cc:     linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 2/2] soc: fsl: guts: Add a missing memory allocation failure check

If 'devm_kstrdup()' fails, we should return -ENOMEM.

While at it, move the 'of_node_put()' call in the error handling path and
after the 'machine' has been copied.
Better safe than sorry.

Suggested-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Not sure of which Fixes tag to add. Should be a6fc3b698130, but since
another commit needs to be reverted for this patch to make sense, I'm
unsure of what to do. :(
So, none is given.
---
 drivers/soc/fsl/guts.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/fsl/guts.c b/drivers/soc/fsl/guts.c
index af7741eafc57..5ed2fc1c53a0 100644
--- a/drivers/soc/fsl/guts.c
+++ b/drivers/soc/fsl/guts.c
@@ -158,9 +158,14 @@ static int fsl_guts_probe(struct platform_device *pdev)
 	root = of_find_node_by_path("/");
 	if (of_property_read_string(root, "model", &machine))
 		of_property_read_string_index(root, "compatible", 0, &machine);
-	of_node_put(root);
-	if (machine)
+	if (machine) {
 		soc_dev_attr.machine = devm_kstrdup(dev, machine, GFP_KERNEL);
+		if (!soc_dev_attr.machine) {
+			of_node_put(root);
+			return -ENOMEM;
+		}
+	}
+	of_node_put(root);
 
 	svr = fsl_guts_get_svr();
 	soc_die = fsl_soc_die_match(svr, fsl_soc_die);
-- 
2.30.2