[PATCH] of: overlay: fix memory leak in add_changeset_node()

[Zeng Heng <zengheng4@xxxxxxxxxx>]

In of_changeset_action(), we have called of_node_get() to increase
refcount of a node.

Therefore, when tchild (duplicated by __of_node_dup()) is done,
of_node_put() needs to call and release the device_node.

Otherwise, there are some memory leak reported about the node:

unreferenced object 0xffff88810cd1e800 (size 256):
  backtrace:
    kmalloc_trace
    __of_node_dup
    add_changeset_node (inlined)
    build_changeset_next_level

unreferenced object 0xffff888113721240 (size 16):
  backtrace:
    __kmalloc_node_track_caller
    kstrdup
    __of_node_dup
    add_changeset_node (inlined)
    build_changeset_next_level

unreferenced object 0xffff88810a38d400 (size 128):
  backtrace:
    kmalloc_trace
    __of_prop_dup
    add_changeset_property
    build_changeset_next_level

Fixes: 7518b5890d8a ("of/overlay: Introduce DT overlay support")
Signed-off-by: Zeng Heng <zengheng4@xxxxxxxxxx>
---
 drivers/of/overlay.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index bd8ff4df723d..a5189a0ec0a3 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -436,8 +436,10 @@ static int add_changeset_node(struct overlay_changeset *ovcs,
 		of_node_set_flag(tchild, OF_OVERLAY);
 
 		ret = of_changeset_attach_node(&ovcs->cset, tchild);
-		if (ret)
+		if (ret) {
+			of_node_put(tchild);
 			return ret;
+		}
 
 		target_child.np = tchild;
 		target_child.in_livetree = false;
-- 
2.25.1