[PATCH 5.2 004/162] ASoC: audio-graph-card: fix use-after-free in graph_dai_link_of_dpcm()

Greg Kroah-Hartman
2019-08-27T08:12:07Z

[ Upstream commit aa2e362cb6b3f5ca88093ada01e1a0ace8a517b2 ]

After calling of_node_put() on the ports, port, and node variables,
they are still being used, which may result in use-after-free.
Fix this issue by calling of_node_put() after the last usage.

Fixes: dd98fbc558a0 ("ASoC: audio-graph-card: cleanup DAI link loop method - step1")
Link: https://lore.kernel.org/r/1562743509-30496-4-git-send-email-wen.yang99@zte.com.cn
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/generic/audio-graph-card.c | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c
index 70ed28d97d497..d5188a179378f 100644
--- a/sound/soc/generic/audio-graph-card.c
+++ b/sound/soc/generic/audio-graph-card.c
@@ -222,10 +222,6 @@ static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,

dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);

- of_node_put(ports);
- of_node_put(port);
- of_node_put(node);
-
if (li->cpu) {
int is_single_links = 0;

@@ -243,17 +239,17 @@ static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,

ret = asoc_simple_parse_cpu(ep, dai_link, &is_single_links);
if (ret)
- return ret;
+ goto out_put_node;

ret = asoc_simple_parse_clk_cpu(dev, ep, dai_link, dai);
if (ret < 0)
- return ret;
+ goto out_put_node;

ret = asoc_simple_set_dailink_name(dev, dai_link,
"fe.%s",
dai_link->cpu_dai_name);
if (ret < 0)
- return ret;
+ goto out_put_node;

/* card->num_links includes Codec */
asoc_simple_canonicalize_cpu(dai_link, is_single_links);
@@ -277,17 +273,17 @@ static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,

ret = asoc_simple_parse_codec(ep, dai_link);
if (ret < 0)
- return ret;
+ goto out_put_node;

ret = asoc_simple_parse_clk_codec(dev, ep, dai_link, dai);
if (ret < 0)
- return ret;
+ goto out_put_node;

ret = asoc_simple_set_dailink_name(dev, dai_link,
"be.%s",
codecs->dai_name);
if (ret < 0)
- return ret;
+ goto out_put_node;

/* check "prefix" from top node */
snd_soc_of_parse_node_prefix(top, cconf, codecs->of_node,
@@ -307,19 +303,23 @@ static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,

ret = asoc_simple_parse_tdm(ep, dai);
if (ret)
- return ret;
+ goto out_put_node;

ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
NULL, &dai_link->dai_fmt);
if (ret < 0)
- return ret;
+ goto out_put_node;

dai_link->dpcm_playback = 1;
dai_link->dpcm_capture = 1;
dai_link->ops = &graph_ops;
dai_link->init = asoc_simple_dai_init;

- return 0;
+out_put_node:
+ of_node_put(ports);
+ of_node_put(port);
+ of_node_put(node);
+ return ret;
}

static int graph_dai_link_of(struct asoc_simple_priv *priv,
--
2.20.1