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>

diff --git a/include/sound/hda_codec.h b/include/sound/hda_codec.h
index b7be300..6d3c82c 100644 (file)
--- a/include/sound/hda_codec.h
+++ b/include/sound/hda_codec.h
@@ -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

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index 15f1507..797bf67 100644 (file)
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -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 */

diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c
index 71db859..d497414 100644 (file)
--- a/sound/hda/hdac_bus.c
+++ b/sound/hda/hdac_bus.c
@@ -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);

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index b1921f9..7be7422 100644 (file)
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -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);

diff --git a/sound/soc/codecs/hda.c b/sound/soc/codecs/hda.c
index edcb8bc..ad20a3d 100644 (file)
--- a/sound/soc/codecs/hda.c
+++ b/sound/soc/codecs/hda.c
@@ -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);