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ALSA: hda: Skip event processing for unregistered codecs

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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
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1
include/sound/hda_codec.h
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@@ -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
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@@ -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 */