linux-kernel - [PATCH v2] of: unittest: fix memory leak in attach_node_and

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Date:   Tue, 26 Nov 2019 02:48:04 +0100
From:   Erhard Furtner <erhard_f@...lbox.org>
To:     linuxppc-dev@...abs.org
Cc:     robh+dt@...nel.org, frowand.list@...il.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Erhard Furtner <erhard_f@...lbox.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>
Subject: [PATCH v2] of: unittest: fix memory leak in attach_node_and_children

In attach_node_and_children memory is allocated for full_name via
kasprintf. If the condition of the 1st if is not met the function
returns early without freeing the memory. Add a kfree() to fix that.

This has been detected with kmemleak:
Link: https://bugzilla.kernel.org/show_bug.cgi?id=205327

It looks like the leak was introduced by this commit:
Fixes: 5babefb7f7ab ("of: unittest: allow base devicetree to have symbol metadata")

Signed-off-by: Erhard Furtner <erhard_f@...lbox.org>
Reviewed-by: Michael Ellerman <mpe@...erman.id.au>
Reviewed-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
---
Changes in v2:
  - Make the commit message more clearer.

 drivers/of/unittest.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 92e895d86458..ca7823eef2b4 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -1146,8 +1146,10 @@ static void attach_node_and_children(struct device_node *np)
 	full_name = kasprintf(GFP_KERNEL, "%pOF", np);
 
 	if (!strcmp(full_name, "/__local_fixups__") ||
-	    !strcmp(full_name, "/__fixups__"))
+	    !strcmp(full_name, "/__fixups__")) {
+		kfree(full_name);
 		return;
+	}
 
 	dup = of_find_node_by_path(full_name);
 	kfree(full_name);
-- 
2.23.0