[PATCH 5.2 002/162] ASoC: simple-card: fix an use-after-free in simple_dai_link_of_dpcm()

Greg Kroah-Hartman
2019-08-27T07:59:50Z

[ Upstream commit 724808ad556c15e9473418d082f8aae81dd267f6 ]

The node variable is still being used after the of_node_put() call,
which may result in use-after-free.

Fixes: cfc652a73331 ("ASoC: simple-card: tidyup prefix for snd_soc_codec_conf")
Link: https://lore.kernel.org/r/1562743509-30496-2-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/simple-card.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index 9b568f578bcd2..544064fdc780c 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -138,8 +138,6 @@ static int simple_dai_link_of_dpcm(struct asoc_simple_priv *priv,

li->link++;

- of_node_put(node);
-
/* For single DAI link & old style of DT node */
if (is_top)
prefix = PREFIX;
@@ -161,17 +159,17 @@ static int simple_dai_link_of_dpcm(struct asoc_simple_priv *priv,

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

ret = asoc_simple_parse_clk_cpu(dev, np, 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;

asoc_simple_canonicalize_cpu(dai_link, is_single_links);
} else {
@@ -194,17 +192,17 @@ static int simple_dai_link_of_dpcm(struct asoc_simple_priv *priv,

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

ret = asoc_simple_parse_clk_codec(dev, np, 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,
@@ -222,19 +220,21 @@ static int simple_dai_link_of_dpcm(struct asoc_simple_priv *priv,

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

ret = asoc_simple_parse_daifmt(dev, node, codec,
prefix, &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 = &simple_ops;
dai_link->init = asoc_simple_dai_init;

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

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