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| author | Takashi Iwai <tiwai@suse.de> | 2011-03-24 09:50:15 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2011-03-25 19:22:50 +0100 |
| commit | a45e3d6b13e97506b616980c0f122c3389bcefa4 (patch) | |
| tree | 838017dcc314bd25b92c31204a15e6fef8a53f1c | |
| parent | b2e65c8e9133218eb28c30e79ddd3d66d4666ba0 (diff) | |
| download | linux-a45e3d6b13e97506b616980c0f122c3389bcefa4.tar.gz linux-a45e3d6b13e97506b616980c0f122c3389bcefa4.tar.bz2 linux-a45e3d6b13e97506b616980c0f122c3389bcefa4.zip | |
ALSA: Fix yet another race in disconnection
This patch fixes a race between snd_card_file_remove() and
snd_card_disconnect(). When the card is added to shutdown_files list
in snd_card_disconnect(), but it's freed in snd_card_file_remove() at
the same time, the shutdown_files list gets corrupted. The list member
must be freed in snd_card_file_remove() as well.
Reported-and-tested-by: Russ Dill <russ.dill@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/core/init.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/core/init.c b/sound/core/init.c index 3e65da21a08c..a0080aa45ae9 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -848,6 +848,7 @@ int snd_card_file_add(struct snd_card *card, struct file *file) return -ENOMEM; mfile->file = file; mfile->disconnected_f_op = NULL; + INIT_LIST_HEAD(&mfile->shutdown_list); spin_lock(&card->files_lock); if (card->shutdown) { spin_unlock(&card->files_lock); @@ -883,6 +884,9 @@ int snd_card_file_remove(struct snd_card *card, struct file *file) list_for_each_entry(mfile, &card->files_list, list) { if (mfile->file == file) { list_del(&mfile->list); + spin_lock(&shutdown_lock); + list_del(&mfile->shutdown_list); + spin_unlock(&shutdown_lock); if (mfile->disconnected_f_op) fops_put(mfile->disconnected_f_op); found = mfile; |