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ASoC: simple-card: fix an use-after-free in simple_dai_link_of_dpcm() 

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

Fixes: cfc652a733 ("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>
This commit is contained in:
Wen Yang 2019-07-10 15:25:06 +08:00 committed by Mark Brown
parent 794fcee8da
commit 724808ad55
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 11 deletions
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22
sound/soc/generic/simple-card.c
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@ -124,8 +124,6 @@ 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;
@ -147,17 +145,17 @@ 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",
cpus->dai_name);
if (ret < 0)
return ret;
goto out_put_node;
asoc_simple_canonicalize_cpu(dai_link, is_single_links);
} else {
@ -180,17 +178,17 @@ 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,
@ -208,19 +206,21 @@ 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,