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ASoC: soc-devres: add devm_snd_soc_register_dai()

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The registration of DAIs may be done at two distinct times, once
during a component registration and later when loading a
topology. Since devm_ managed resources are freed in the reverse order
they were allocated, when a component starts unregistering DAIs by
walking through the DAI list, the memory allocated for the
topology-registered DAIs was freed already, which leads to 100%
reproducible KASAN use-after-free reports.

This patch suggests a new devm_ function to force the DAI list to be
updated prior to freeing the memory chunks referenced by the list
pointers.

Suggested-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
BugLink: https://github.com/thesofproject/linux/issues/2186
Link: https://lore.kernel.org/r/20200612205938.26415-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-06-12 15:59:37 -05:00 committed by Mark Brown
parent b287a6d972
commit 0fae253af5
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 41 additions and 0 deletions
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4
include/sound/soc.h
View File

@ -1363,6 +1363,10 @@ void snd_soc_remove_pcm_runtime(struct snd_soc_card *card,
struct snd_soc_dai *snd_soc_register_dai(struct snd_soc_component *component,
struct snd_soc_dai_driver *dai_drv,
bool legacy_dai_naming);
struct snd_soc_dai *devm_snd_soc_register_dai(struct device *dev,
struct snd_soc_component *component,
struct snd_soc_dai_driver *dai_drv,
bool legacy_dai_naming);
void snd_soc_unregister_dai(struct snd_soc_dai *dai);
struct snd_soc_dai *snd_soc_find_dai(

37
sound/soc/soc-devres.c
View File

@ -9,6 +9,43 @@
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
static void devm_dai_release(struct device *dev, void *res)
{
snd_soc_unregister_dai(*(struct snd_soc_dai **)res);
}
/**
* devm_snd_soc_register_dai - resource-managed dai registration
* @dev: Device used to manage component
* @component: The component the DAIs are registered for
* @dai_drv: DAI driver to use for the DAI
* @legacy_dai_naming: if %true, use legacy single-name format;
* if %false, use multiple-name format;
*/
struct snd_soc_dai *devm_snd_soc_register_dai(struct device *dev,
struct snd_soc_component *component,
struct snd_soc_dai_driver *dai_drv,
bool legacy_dai_naming)
{
struct snd_soc_dai **ptr;
struct snd_soc_dai *dai;
ptr = devres_alloc(devm_dai_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return NULL;
dai = snd_soc_register_dai(component, dai_drv, legacy_dai_naming);
if (dai) {
*ptr = dai;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return dai;
}
EXPORT_SYMBOL_GPL(devm_snd_soc_register_dai);
static void devm_component_release(struct device *dev, void *res)
{
snd_soc_unregister_component(*(struct device **)res);