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ALSA: hda: hda_component: Fix mutex crash if nothing ever binds

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Move the initialization of parent->mutex into
hda_component_manager_init() so that it is always valid.

In hda_component_manager_bind() do not clear the parent information.
Only zero-fill the per-component data ready for it to be filled in
by the components as they bind.

Previously parent->mutex was being initialized only in
hda_component_manager_bind(). This meant that it was only
initialized if all components appeared and there was a bind callback.
If there wasn't a bind the mutex object was not valid when the
Realtek driver called any of the other functions.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 047b9cbbaa ("ALSA: hda: hda_component: Protect shared data with a mutex")
Link: https://patch.msgid.link/20240826094940.45563-1-rf@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Richard Fitzgerald 2024-08-26 10:49:40 +01:00 committed by Takashi Iwai
parent 2dc43c5e21
commit 28b329f431
1 changed files with 3 additions and 2 deletions
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5
sound/pci/hda/hda_component.c
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@ -141,8 +141,7 @@ int hda_component_manager_bind(struct hda_codec *cdc,
int ret;
/* Init shared and component specific data */
memset(parent, 0, sizeof(*parent));
mutex_init(&parent->mutex);
memset(parent->comps, 0, sizeof(parent->comps));
parent->codec = cdc;
mutex_lock(&parent->mutex);
@ -164,6 +163,8 @@ int hda_component_manager_init(struct hda_codec *cdc,
struct hda_scodec_match *sm;
int ret, i;
mutex_init(&parent->mutex);
for (i = 0; i < count; i++) {
sm = devm_kmalloc(dev, sizeof(*sm), GFP_KERNEL);
if (!sm)