[PATCH 5.19 0953/1157] ASoc: audio-graph-card2: Fix refcount leak bug in __graph_get_type()

Greg Kroah-Hartman
2022-08-16T04:47:32Z

From: Liang He <windhl@126.com>

[ Upstream commit eda26893dabfc6da7a1e1ff5f8628ed9faab3ab9 ]

We should call of_node_put() for the reference before its replacement
as it returned by of_get_parent() which has increased the refcount.
Besides, we should also call of_node_put() before return.

Fixes: c8c74939f791 ("ASoC: audio-graph-card2: add Multi CPU/Codec support")
Signed-off-by: Liang He <windhl@126.com>
Link: https://lore.kernel.org/r/20220713071200.366729-1-windhl@126.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/generic/audio-graph-card2.c | 35 +++++++++++++++++++--------
1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/sound/soc/generic/audio-graph-card2.c b/sound/soc/generic/audio-graph-card2.c
index 8e0628e6f2a0..5dba7c89007d 100644
--- a/sound/soc/generic/audio-graph-card2.c
+++ b/sound/soc/generic/audio-graph-card2.c
@@ -229,7 +229,8 @@ enum graph_type {

static enum graph_type __graph_get_type(struct device_node *lnk)
{
- struct device_node *np;
+ struct device_node *np, *parent_np;
+ enum graph_type ret;

/*
* target {
@@ -240,19 +241,33 @@ static enum graph_type __graph_get_type(struct device_node *lnk)
* };
*/
np = of_get_parent(lnk);
- if (of_node_name_eq(np, "ports"))
- np = of_get_parent(np);
+ if (of_node_name_eq(np, "ports")) {
+ parent_np = of_get_parent(np);
+ of_node_put(np);
+ np = parent_np;
+ }

- if (of_node_name_eq(np, GRAPH_NODENAME_MULTI))
- return GRAPH_MULTI;
+ if (of_node_name_eq(np, GRAPH_NODENAME_MULTI)) {
+ ret = GRAPH_MULTI;
+ goto out_put;
+ }

- if (of_node_name_eq(np, GRAPH_NODENAME_DPCM))
- return GRAPH_DPCM;
+ if (of_node_name_eq(np, GRAPH_NODENAME_DPCM)) {
+ ret = GRAPH_DPCM;
+ goto out_put;
+ }

- if (of_node_name_eq(np, GRAPH_NODENAME_C2C))
- return GRAPH_C2C;
+ if (of_node_name_eq(np, GRAPH_NODENAME_C2C)) {
+ ret = GRAPH_C2C;
+ goto out_put;
+ }
+
+ ret = GRAPH_NORMAL;
+
+out_put:
+ of_node_put(np);
+ return ret;

- return GRAPH_NORMAL;
}

static enum graph_type graph_get_type(struct asoc_simple_priv *priv,
--
2.35.1