[PATCH 5.4 112/191] of: unittest: fix memory leak in attach_node_and_children

From: Greg Kroah-Hartman
Date: Thu Jan 02 2020 - 17:15:31 EST

From: Erhard Furtner <erhard_f@xxxxxxxxxxx>

[ 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@xxxxxxxxxxx>
Reviewed-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Reviewed-by: Tyrel Datwyler <tyreld@xxxxxxxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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);
+ }

dup = of_find_node_by_path(full_name);