linux-kernel - [PATCH 5.4 112/191] of: unittest: fix memory leak in attach_node_and

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Date:   Thu,  2 Jan 2020 23:06:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Erhard Furtner <erhard_f@...lbox.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>,
        Rob Herring <robh@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 112/191] of: unittest: fix memory leak in attach_node_and_children

From: Erhard Furtner <erhard_f@...lbox.org>

[ Upstream commit 2aacace6dbbb6b6ce4e177e6c7ea901f389c0472 ]

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>
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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);
-- 
2.20.1