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ALSA: hda: Skip event processing for unregistered codecs 

When codec is unbound but not yet removed, in the eyes of
snd_hdac_bus_process_unsol_events() it is still a valid target to
delegate work to. Such behaviour may lead to use-after-free errors.
Address by verifying if codec is actually registered.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220706120230.427296-6-cezary.rojewski@intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Cezary Rojewski 2022-07-06 14:02:26 +02:00 committed by Takashi Iwai
parent 622f219945
commit e7255c00b1
5 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/sound/hda_codec.h
View File

@ -231,7 +231,6 @@ struct hda_codec {
/* misc flags */
unsigned int configured:1; /* codec was configured */
unsigned int in_freeing:1; /* being released */
unsigned int registered:1; /* codec was registered */
unsigned int display_power_control:1; /* needs display power */
unsigned int spdif_status_reset :1; /* needs to toggle SPDIF for each
* status change

1
include/sound/hdaudio.h
View File

@ -93,6 +93,7 @@ struct hdac_device {
bool lazy_cache:1; /* don't wake up for writes */
bool caps_overwriting:1; /* caps overwrite being in process */
bool cache_coef:1; /* cache COEF read/write too */
unsigned int registered:1; /* codec was registered */
};
/* device/driver type used for matching */

2
sound/hda/hdac_bus.c
View File

@ -183,7 +183,7 @@ static void snd_hdac_bus_process_unsol_events(struct work_struct *work)
if (!(caddr & (1 << 4))) /* no unsolicited event? */
continue;
codec = bus->caddr_tbl[caddr & 0x0f];
if (!codec || !codec->dev.driver)
if (!codec || !codec->registered)
continue;
spin_unlock_irq(&bus->reg_lock);
drv = drv_to_hdac_driver(codec->dev.driver);

10
sound/pci/hda/hda_codec.c
View File

@ -772,11 +772,11 @@ static void codec_release_pcms(struct hda_codec *codec)
*/
void snd_hda_codec_cleanup_for_unbind(struct hda_codec *codec)
{
if (codec->registered) {
if (codec->core.registered) {
/* pm_runtime_put() is called in snd_hdac_device_exit() */
pm_runtime_get_noresume(hda_codec_dev(codec));
pm_runtime_disable(hda_codec_dev(codec));
codec->registered = 0;
codec->core.registered = 0;
}
snd_hda_codec_disconnect_pcms(codec);
@ -825,14 +825,14 @@ void snd_hda_codec_display_power(struct hda_codec *codec, bool enable)
*/
void snd_hda_codec_register(struct hda_codec *codec)
{
if (codec->registered)
if (codec->core.registered)
return;
if (device_is_registered(hda_codec_dev(codec))) {
snd_hda_codec_display_power(codec, true);
pm_runtime_enable(hda_codec_dev(codec));
/* it was powered up in snd_hda_codec_new(), now all done */
snd_hda_power_down(codec);
codec->registered = 1;
codec->core.registered = 1;
}
}
EXPORT_SYMBOL_GPL(snd_hda_codec_register);
@ -3047,7 +3047,7 @@ void snd_hda_codec_shutdown(struct hda_codec *codec)
struct hda_pcm *cpcm;
/* Skip the shutdown if codec is not registered */
if (!codec->registered)
if (!codec->core.registered)
return;
cancel_delayed_work_sync(&codec->jackpoll_work);

4
sound/soc/codecs/hda.c
View File

@ -274,7 +274,7 @@ static void hda_codec_remove(struct snd_soc_component *component)
struct hdac_device *hdev = &codec->core;
struct hdac_bus *bus = hdev->bus;
struct hdac_ext_link *hlink;
bool was_registered = codec->registered;
bool was_registered = codec->core.registered;
/* Don't allow any more runtime suspends */
pm_runtime_forbid(&hdev->dev);
@ -376,7 +376,7 @@ static int hda_hdev_detach(struct hdac_device *hdev)
{
struct hda_codec *codec = dev_to_hda_codec(&hdev->dev);
if (codec->registered)
if (codec->core.registered)
cancel_delayed_work_sync(&codec->jackpoll_work);
snd_soc_unregister_component(&hdev->dev);