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linux-stable/sound/core
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Takashi Iwai 00b83a8f59 ALSA: seq: oss: Avoid mutex lock for a long-time ioctl 
[ Upstream commit 2759caad26 ]

Recently we applied a fix to cover the whole OSS sequencer ioctls with
the mutex for dealing with the possible races.  This works fine in
general, but in theory, this may lead to unexpectedly long stall if an
ioctl like SNDCTL_SEQ_SYNC is issued and an event with the far future
timestamp was queued.

For fixing such a potential stall, this patch changes the mutex lock
applied conditionally excluding such an ioctl command.  Also, change
the mutex_lock() with the interruptible version for user to allow
escaping from the big-hammer mutex.

Fixes: 80982c7e83 ("ALSA: seq: oss: Serialize ioctls")
Suggested-by: Pavel Machek <pavel@ucw.cz>
Link: https://lore.kernel.org/r/20200922083856.28572-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-10-29 09:07:06 +01:00
..
oss ALSA: pcm: oss: Remove superfluous WARN_ON() for mulaw sanity check 2020-09-09 19:03:11 +02:00
seq ALSA: seq: oss: Avoid mutex lock for a long-time ioctl 2020-10-29 09:07:06 +01:00
compress_offload.c ALSA: compress: fix partial_drain completion state 2020-07-22 09:22:17 +02:00
control.c ALSA: ctl: allow TLV read operation for callback type of element in locked case 2020-02-28 16:35:55 +01:00
control_compat.c ALSA: control: fix a redundant-copy issue 2018-05-22 18:53:56 +02:00
ctljack.c ALSA: declare snd_kcontrol_new structures as const 2017-05-30 10:29:25 +02:00
device.c ALSA: core: Use %pS printk format for direct addresses 2017-09-07 10:36:02 +02:00
hrtimer.c ALSA: timer: Limit max instances per timer 2017-11-06 10:41:24 +01:00
hwdep.c ALSA: hwdep: fix a left shifting 1 by 31 UB bug 2020-06-03 08:18:01 +02:00
hwdep_compat.c
info.c ALSA: info: Drop WARN_ON() from buffer NULL sanity check 2020-07-29 07:42:52 +02:00
info_oss.c ALSA: core: Follow standard EXPORT_SYMBOL() declarations 2017-06-16 16:19:16 +02:00
init.c ALSA: core: Fix card races between register and disconnect 2019-04-27 09:35:37 +02:00
isadma.c ALSA: core: Follow standard EXPORT_SYMBOL() declarations 2017-06-16 16:19:16 +02:00
jack.c
Kconfig ALSA: seq: Allow the modular sequencer registration 2017-06-12 08:43:33 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
memalloc.c ALSA: memalloc: Don't exceed over the requested size 2018-08-22 07:46:10 +02:00
memory.c ALSA: core: Follow standard EXPORT_SYMBOL() declarations 2017-06-16 16:19:16 +02:00
misc.c ALSA: core: Follow standard EXPORT_SYMBOL() declarations 2017-06-16 16:19:16 +02:00
pcm.c ALSA: pcm: Fix potential Spectre v1 vulnerability 2019-01-09 17:14:46 +01:00
pcm_compat.c ALSA: pcm: Check PCM state at xfern compat ioctl 2018-05-09 09:51:49 +02:00
pcm_dmaengine.c
pcm_drm_eld.c ALSA: pcm: use helper function to refer parameter as read-only 2017-05-17 07:24:39 +02:00
pcm_iec958.c
pcm_lib.c ALSA: pcm: fix incorrect hw_base increase 2020-05-27 16:43:07 +02:00
pcm_local.h ALSA: pcm: unify codes to operate application-side position on PCM buffer 2017-06-12 08:49:22 +02:00
pcm_memory.c ALSA: pcm: Follow standard EXPORT_SYMBOL() declarations 2017-06-16 16:18:58 +02:00
pcm_misc.c ALSA: pcm: Follow standard EXPORT_SYMBOL() declarations 2017-06-16 16:18:58 +02:00
pcm_native.c ALSA: pcm: disallow linking stream to itself 2020-06-20 10:25:02 +02:00
pcm_param_trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pcm_timer.c ALSA: pcm: include pcm_local.h and remove some extraneous tabs 2017-05-30 18:04:47 +02:00
pcm_trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rawmidi.c ALSA: rawmidi: Fix racy buffer resize under concurrent accesses 2020-05-20 08:17:14 +02:00
rawmidi_compat.c ALSA: rawmidi: Fix missing input substream checks in compat ioctls 2018-04-24 09:36:36 +02:00
seq_device.c ALSA: seq: Cancel pending autoload work at unbinding device 2017-09-12 12:41:20 +02:00
sgbuf.c
sound.c ALSA: core: Follow standard EXPORT_SYMBOL() declarations 2017-06-16 16:19:16 +02:00
sound_oss.c ALSA: core: Follow standard EXPORT_SYMBOL() declarations 2017-06-16 16:19:16 +02:00
timer.c ALSA: timer: Limit max amount of slave instances 2019-12-31 12:37:23 +01:00
timer_compat.c ALSA: timer: Remove kernel warning at compat ioctl error paths 2017-11-30 08:40:48 +00:00
vmaster.c ALSA: vmaster: Propagate slave error 2018-05-30 07:52:35 +02:00