[PATCH AUTOSEL 6.1 09/38] ALSA: hda: Do not unset preset when cleaning up codec
From: Sasha Levin
Date: Thu Feb 09 2023 - 06:16:30 EST
From: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
[ Upstream commit 87978e6ad45a16835cc58234451111091be3c59a ]
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@xxxxxxxx>
Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230119143235.1159814-1-cezary.rojewski@xxxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
sound/pci/hda/hda_bind.c | 2 ++
sound/pci/hda/hda_codec.c | 1 -
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/sound/pci/hda/hda_bind.c b/sound/pci/hda/hda_bind.c
index 1a868dd9dc4b6..890c2f7c33fc2 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 edd653ece70d7..ac1cc7c5290e3 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);
--
2.39.0