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ASoC: sof_es8336: fix possible use-after-free in sof_es8336_remove()

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sof_es8336_remove() calls cancel_delayed_work(). However, that
function does not wait until the work function finishes. This
means that the callback function may still be running after
the driver's remove function has finished, which would result
in a use-after-free.

Fix by calling cancel_delayed_work_sync(), which ensures that
the work is properly cancelled, no longer running, and unable
to re-schedule itself.

Fixes: 89cdb224f2 ("ASoC: sof_es8336: reduce pop noise on speaker")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20221205143721.3988988-1-yangyingliang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Yang Yingliang 2022-12-05 22:37:21 +08:00 committed by Mark Brown
parent 9472382db3
commit 1b41beaa7a
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GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
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2
sound/soc/intel/boards/sof_es8336.c
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@ -783,7 +783,7 @@ static int sof_es8336_remove(struct platform_device *pdev)
struct snd_soc_card *card = platform_get_drvdata(pdev);
struct sof_es8336_private *priv = snd_soc_card_get_drvdata(card);
cancel_delayed_work(&priv->pcm_pop_work);
cancel_delayed_work_sync(&priv->pcm_pop_work);
gpiod_put(priv->gpio_speakers);
device_remove_software_node(priv->codec_dev);
put_device(priv->codec_dev);