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| author | Cezary Rojewski <cezary.rojewski@intel.com> | 2023-01-19 15:32:35 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-01-23 09:11:19 +0100 |
| commit | 87978e6ad45a16835cc58234451111091be3c59a (patch) | |
| tree | be9f470579ab6216286992d6870a1a4ec456bc9c /sound/pci | |
| parent | ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path() (diff) | |
| download | linux-87978e6ad45a16835cc58234451111091be3c59a.tar.xz linux-87978e6ad45a16835cc58234451111091be3c59a.zip | |
ALSA: hda: Do not unset preset when cleaning up codec
Several functions that take part in codec's initialization and removal
are re-used by ASoC codec drivers implementations. Drivers mimic the
behavior of hda_codec_driver_probe/remove() found in
sound/pci/hda/hda_bind.c with their component->probe/remove() instead.
One of the reasons for that is the expectation of
snd_hda_codec_device_new() to receive a valid pointer to an instance of
struct snd_card. This expectation can be met only once sound card
components probing commences.
As ASoC sound card may be unbound without codec device being actually
removed from the system, unsetting ->preset in
snd_hda_codec_cleanup_for_unbind() interferes with module unload -> load
scenario causing null-ptr-deref. Preset is assigned only once, during
device/driver matching whereas ASoC codec driver's module reloading may
occur several times throughout the lifetime of an audio stack.
Suggested-by: Takashi Iwai <tiwai@suse.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20230119143235.1159814-1-cezary.rojewski@intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci')
| -rw-r--r-- | sound/pci/hda/hda_bind.c | 2 | ||||
| -rw-r--r-- | sound/pci/hda/hda_codec.c | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_bind.c b/sound/pci/hda/hda_bind.c index 1a868dd9dc4b..890c2f7c33fc 100644 --- a/sound/pci/hda/hda_bind.c +++ b/sound/pci/hda/hda_bind.c @@ -144,6 +144,7 @@ static int hda_codec_driver_probe(struct device *dev) error: snd_hda_codec_cleanup_for_unbind(codec); + codec->preset = NULL; return err; } @@ -166,6 +167,7 @@ static int hda_codec_driver_remove(struct device *dev) if (codec->patch_ops.free) codec->patch_ops.free(codec); snd_hda_codec_cleanup_for_unbind(codec); + codec->preset = NULL; module_put(dev->driver->owner); return 0; } diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index edd653ece70d..ac1cc7c5290e 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -795,7 +795,6 @@ void snd_hda_codec_cleanup_for_unbind(struct hda_codec *codec) snd_array_free(&codec->cvt_setups); snd_array_free(&codec->spdif_out); snd_array_free(&codec->verbs); - codec->preset = NULL; codec->follower_dig_outs = NULL; codec->spdif_status_reset = 0; snd_array_free(&codec->mixers); |