Patchwork [3.5.y.z,extended,stable] Patch "ALSA: Fix card refcount unbalance" has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Dec. 6, 2012, 3:24 a.m.
Message ID <1354764270-29229-1-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/204115/
State New
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Comments

Herton Ronaldo Krzesinski - Dec. 6, 2012, 3:24 a.m.
This is a note to let you know that I have just added a patch titled

    ALSA: Fix card refcount unbalance

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

From 4b0d680e708f1fbed1063bd488054293fc156e64 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Thu, 8 Nov 2012 14:36:18 +0100
Subject: [PATCH] ALSA: Fix card refcount unbalance
X-Extended-Stable: 3.5

commit 8bb4d9ce08b0a92ca174e41d92c180328f86173f upstream.

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

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 sound/core/oss/mixer_oss.c |    1 +
 sound/core/oss/pcm_oss.c   |    1 +
 sound/core/pcm_native.c    |    6 ++++--
 sound/core/sound.c         |    2 +-
 sound/core/sound_oss.c     |    2 +-
 5 files changed, 8 insertions(+), 4 deletions(-)

--
1.7.9.5

Patch

diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index 05395aa..c353768 100644
--- 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
--- 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 d15e5be..bf3bf43 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -2121,7 +2121,8 @@  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;
 }

@@ -2134,7 +2135,8 @@  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 7c0640e..3700d96 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -115,7 +115,7 @@  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
--- 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;