of: Fix refcount leakage for OF node returned by __of_get_dma_parent()

commit 5d009e024056ded20c5bb1583146b833b23bbd5a upstream.

__of_get_dma_parent() returns OF device node @args.np, but the node's
refcount is increased twice, by both of_parse_phandle_with_args() and
of_node_get(), so causes refcount leakage for the node.

Fix by directly returning the node got by of_parse_phandle_with_args().

Fixes: f83a6e5dea6c ("of: address: Add support for the parent DMA bus")
Cc: stable@vger.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20241206-of_core_fix-v1-4-dc28ed56bec3@quicinc.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/of/address.c b/drivers/of/address.c
index f686fb5011b875457a8a2fcefe383014a893f241..7e2bfbb22430bb2f6cb11c1b8703f79cde984aa9 100644 (file)
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -641,7 +641,7 @@ static struct device_node *__of_get_dma_parent(const struct device_node *np)
        if (ret < 0)
                return of_get_parent(np);
 
-       return of_node_get(args.np);
+       return args.np;
 }
 
 static struct device_node *of_get_next_dma_parent(struct device_node *np)