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ASoC: audio-graph-card: fix use-after-free in graph_dai_link_of_dpcm() 

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: dd98fbc558 ("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>
alistair/sunxi64-5.4-dsi
Wen Yang 2019-07-10 15:25:08 +08:00 committed by Mark Brown
parent 27862d5a33
commit aa2e362cb6
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 13 additions and 13 deletions
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26
sound/soc/generic/audio-graph-card.c
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@ -208,10 +208,6 @@ 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;
@ -229,17 +225,17 @@ 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",
cpus->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);
@ -263,17 +259,17 @@ 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,
@ -293,19 +289,23 @@ 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,