ALSA: Fix card refcount unbalance

There are uncovered cases whether the card refcount introduced by the
commit a0830dbd isn't properly increased or decreased:
- OSS PCM and mixer success paths
- When lookup function gets NULL

This patch fixes these places.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=50251

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index a9a2e63..e8a1d18 100644 (file)
--- a/sound/core/oss/mixer_oss.c
+++ b/sound/core/oss/mixer_oss.c
@@ -76,6 +76,7 @@ static int snd_mixer_oss_open(struct inode *inode, struct file *file)
                snd_card_unref(card);
                return -EFAULT;
        }
+       snd_card_unref(card);
        return 0;
 }
 

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index f337b66..4c1cc51 100644 (file)
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -2454,6 +2454,7 @@ static int snd_pcm_oss_open(struct inode *inode, struct file *file)
        mutex_unlock(&pcm->open_mutex);
        if (err < 0)
                goto __error;
+       snd_card_unref(pcm->card);
        return err;
 
       __error:

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 6e8872d..f9ddecf 100644 (file)
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -2122,7 +2122,8 @@ static int snd_pcm_playback_open(struct inode *inode, struct file *file)
        pcm = snd_lookup_minor_data(iminor(inode),
                                    SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
        err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
-       snd_card_unref(pcm->card);
+       if (pcm)
+               snd_card_unref(pcm->card);
        return err;
 }
 
@@ -2135,7 +2136,8 @@ static int snd_pcm_capture_open(struct inode *inode, struct file *file)
        pcm = snd_lookup_minor_data(iminor(inode),
                                    SNDRV_DEVICE_TYPE_PCM_CAPTURE);
        err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
-       snd_card_unref(pcm->card);
+       if (pcm)
+               snd_card_unref(pcm->card);
        return err;
 }
 

diff --git a/sound/core/sound.c b/sound/core/sound.c
index 89780c3..70ccdab 100644 (file)
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -114,7 +114,7 @@ void *snd_lookup_minor_data(unsigned int minor, int type)
        mreg = snd_minors[minor];
        if (mreg && mreg->type == type) {
                private_data = mreg->private_data;
-               if (mreg->card_ptr)
+               if (private_data && mreg->card_ptr)
                        atomic_inc(&mreg->card_ptr->refcount);
        } else
                private_data = NULL;

diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c
index e1d79ee..726a49a 100644 (file)
--- a/sound/core/sound_oss.c
+++ b/sound/core/sound_oss.c
@@ -54,7 +54,7 @@ void *snd_lookup_oss_minor_data(unsigned int minor, int type)
        mreg = snd_oss_minors[minor];
        if (mreg && mreg->type == type) {
                private_data = mreg->private_data;
-               if (mreg->card_ptr)
+               if (private_data && mreg->card_ptr)
                        atomic_inc(&mreg->card_ptr->refcount);
        } else
                private_data = NULL;