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| author |   Jiasheng Jiang <jiasheng@iscas.ac.cn> | 2021-10-15 08:13:53 +0000 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2022-03-02 13:45:26 +0000 |
| commit | de2c6f98817fa5decb9b7d3b3a8a3ab864c10588 (patch) | |
| tree | 3cbe4995a1a6d9b0dc848159eafd8af878069db3 | |
| parent | ASoC: soc-generic-dmaengine-pcm: set period_bytes_min based on maxburst (diff) | |
| download | linux-dev-de2c6f98817fa5decb9b7d3b3a8a3ab864c10588.tar.xz linux-dev-de2c6f98817fa5decb9b7d3b3a8a3ab864c10588.zip | |
ASoC: soc-compress: prevent the potentially use of null pointer
There is one call trace that snd_soc_register_card()
->snd_soc_bind_card()->soc_init_pcm_runtime()
->snd_soc_dai_compress_new()->snd_soc_new_compress().
In the trace the 'codec_dai' transfers from card->dai_link,
and we can see from the snd_soc_add_pcm_runtime() in
snd_soc_bind_card() that, if value of card->dai_link->num_codecs
is 0, then 'codec_dai' could be null pointer caused
by index out of bound in 'asoc_rtd_to_codec(rtd, 0)'.
And snd_soc_register_card() is called by various platforms.
Therefore, it is better to add the check in the case of misusing.
And because 'cpu_dai' has already checked in soc_init_pcm_runtime(),
there is no need to check again.
Adding the check as follow, then if 'codec_dai' is null,
snd_soc_new_compress() will not pass through the check
'if (playback + capture != 1)', avoiding the leftover use of
'codec_dai'.
Fixes: 467fece ("ASoC: soc-dai: move snd_soc_dai_stream_valid() to soc-dai.c")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/1634285633-529368-1-git-send-email-jiasheng@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | sound/soc/soc-compress.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/sound/soc/soc-compress.c b/sound/soc/soc-compress.c index 8e2494a9f3a7..f4b376a71be8 100644 --- a/sound/soc/soc-compress.c +++ b/sound/soc/soc-compress.c @@ -568,12 +568,14 @@ int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num) } /* check client and interface hw capabilities */ - if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) && - snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_PLAYBACK)) - playback = 1; - if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) && - snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_CAPTURE)) - capture = 1; + if (codec_dai) { + if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) && + snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_PLAYBACK)) + playback = 1; + if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) && + snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_CAPTURE)) + capture = 1; + } /* * Compress devices are unidirectional so only one of the directions |