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ALSA: seq: oss: Don't drain at closing a client

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The OSS sequencer client tries to drain the pending events at
releasing.  Unfortunately, as spotted by syzkaller fuzzer, this may
lead to an unkillable process state when the event has been queued at
the far future.  Since the process being released can't be signaled
any longer, it remains and waits for the echo-back event in that far
future.

Back to history, the draining feature was implemented at the time we
misinterpreted POSIX definition for blocking file operation.
Actually, such a behavior is superfluous at release, and we should
just release the device as is instead of keeping it up forever.

This patch just removes the draining call that may block the release
for too long time unexpectedly.

BugLink: http://lkml.kernel.org/r/CACT4Y+Y4kD-aBGj37rf-xBw9bH3GMU6P+MYg4W1e-s-paVD2pg@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-03-01 18:30:18 +01:00
parent 17e2df4613
commit 197b958c1e
3 changed files with 0 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sound/core/seq/oss/seq_oss.c
View File

@ -149,8 +149,6 @@ odev_release(struct inode *inode, struct file *file)
if ((dp = file->private_data) == NULL)
return 0;
snd_seq_oss_drain_write(dp);
mutex_lock(&register_mutex);
snd_seq_oss_release(dp);
mutex_unlock(&register_mutex);

1
sound/core/seq/oss/seq_oss_device.h
View File

@ -127,7 +127,6 @@ int snd_seq_oss_write(struct seq_oss_devinfo *dp, const char __user *buf, int co
unsigned int snd_seq_oss_poll(struct seq_oss_devinfo *dp, struct file *file, poll_table * wait);
void snd_seq_oss_reset(struct seq_oss_devinfo *dp);
void snd_seq_oss_drain_write(struct seq_oss_devinfo *dp);
/* */
void snd_seq_oss_process_queue(struct seq_oss_devinfo *dp, abstime_t time);

16
sound/core/seq/oss/seq_oss_init.c
View File

@ -435,22 +435,6 @@ snd_seq_oss_release(struct seq_oss_devinfo *dp)
}
/*
* Wait until the queue is empty (if we don't have nonblock)
*/
void
snd_seq_oss_drain_write(struct seq_oss_devinfo *dp)
{
if (! dp->timer->running)
return;
if (is_write_mode(dp->file_mode) && !is_nonblock_mode(dp->file_mode) &&
dp->writeq) {
while (snd_seq_oss_writeq_sync(dp->writeq))
;
}
}
/*
* reset sequencer devices
*/