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3aa02cb664
linux/sound/core
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Takashi Iwai 3aa02cb664 ALSA: pcm : Call kill_fasync() in stream lock 
Currently kill_fasync() is called outside the stream lock in
snd_pcm_period_elapsed().  This is potentially racy, since the stream
may get released even during the irq handler is running.  Although
snd_pcm_release_substream() calls snd_pcm_drop(), this doesn't
guarantee that the irq handler finishes, thus the kill_fasync() call
outside the stream spin lock may be invoked after the substream is
detached, as recently reported by KASAN.

As a quick workaround, move kill_fasync() call inside the stream
lock.  The fasync is rarely used interface, so this shouldn't have a
big impact from the performance POV.

Ideally, we should implement some sync mechanism for the proper finish
of stream and irq handler.  But this oneliner should suffice for most
cases, so far.

Reported-by: Baozeng Ding <sploving1@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-04-14 18:02:37 +02:00
..
oss ALSA: pcm: Fix potential deadlock in OSS emulation 2016-02-01 12:23:29 +01:00
seq ALSA: seq: Provide card number / PID via sequencer client info 2016-03-08 10:52:52 +01:00
compress_offload.c ALSA: compress: fix more typos 2016-03-04 21:55:36 +01:00
control_compat.c ALSA: ctl: change return value in compatibility layer so that it's the same value in core implementation 2016-03-17 14:11:36 +01:00
control.c ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0 2016-01-18 14:40:07 +01:00
ctljack.c ALSA: jack: Fix endless loop at unique index detection 2015-06-26 06:59:57 +02:00
device.c Merge branch 'topic/hda-unbind' into for-next 2015-03-16 14:48:20 +01:00
hrtimer.c ALSA: hrtimer: Fix stall by hrtimer_cancel() 2016-01-18 14:33:30 +01:00
hwdep_compat.c
hwdep.c ALSA: replace CONFIG_PROC_FS with CONFIG_SND_PROC_FS 2015-05-27 21:25:19 +02:00
info_oss.c ALSA: core: Clean up OSS proc file management 2015-04-24 17:31:08 +02:00
info.c ALSA: info: Drop kerneldoc comment from snd_info_create_entry() 2015-05-18 09:45:11 +02:00
init.c ALSA: hda_intel: add card number to irq description 2016-01-12 21:05:16 +01:00
isadma.c ALSA: core: Use standard printk helpers 2014-02-14 08:14:15 +01:00
jack.c ALSA: jack: Allow building the jack layer without input device 2016-02-23 09:03:07 +01:00
Kconfig ALSA: jack: Allow building the jack layer without input device 2016-02-23 09:03:07 +01:00
Makefile ALSA: timer: add config item to export PCM timer disabling for expert 2015-10-16 14:31:38 +02:00
memalloc.c genalloc: rename of_get_named_gen_pool() to of_gen_pool_get() 2015-06-30 19:45:01 -07:00
memory.c ALSA: Include linux/uaccess.h and linux/bitopts.h instead of asm/* 2015-01-28 17:25:07 +01:00
misc.c ALSA: Allow pass NULL dev for snd_pci_quirk_lookup() 2014-10-08 12:08:38 +02:00
pcm_compat.c ALSA: pcm: Fix ioctls for X32 ABI 2016-02-28 17:44:35 +01:00
pcm_dmaengine.c ALSA: pcm_dmaengine: Properly synchronize DMA on shutdown 2015-11-16 08:28:52 +05:30
pcm_drm_eld.c ALSA: pcm: add DRM ELD helper 2015-05-22 16:01:44 +02:00
pcm_iec958.c ALSA: pcm: add IEC958 channel status helper 2015-05-22 16:01:47 +02:00
pcm_lib.c ALSA: pcm : Call kill_fasync() in stream lock 2016-04-14 18:02:37 +02:00
pcm_memory.c ALSA: Include linux/io.h instead of asm/io.h 2015-01-28 16:49:33 +01:00
pcm_misc.c ALSA: pcm: Add snd_pcm_rate_range_to_bits() 2016-02-05 18:49:00 +00:00
pcm_native.c ALSA: pcm: Fix rwsem deadlock for non-atomic PCM stream 2016-02-18 11:27:52 +01:00
pcm_timer.c ALSA: pcm: Use standard printk helpers 2014-02-14 08:14:15 +01:00
pcm_trace.h ALSA: pcm: Replace PCM hwptr tracking with tracepoints 2014-11-04 14:09:14 +01:00
pcm.c ALSA: pcm: remove structure member of 'struct snd_pcm_hwptr_log *' type because this structure had been removed 2015-09-13 12:03:15 +02:00
rawmidi_compat.c ALSA: rawmidi: Fix ioctls X32 ABI 2016-02-28 17:44:51 +01:00
rawmidi.c ALSA: rawmidi: Fix race at copying & updating the position 2016-02-03 14:51:42 +01:00
rtctimer.c ALSA: timer: Use standard printk helpers 2014-02-14 08:14:17 +01:00
sgbuf.c ALSA: core: Deletion of unnecessary checks before two function calls 2014-11-21 20:06:57 +01:00
sound_oss.c ALSA: replace CONFIG_PROC_FS with CONFIG_SND_PROC_FS 2015-05-27 21:25:19 +02:00
sound.c ALSA: replace CONFIG_PROC_FS with CONFIG_SND_PROC_FS 2015-05-27 21:25:19 +02:00
timer_compat.c ALSA: timer: fix gparams ioctl compatibility for different architectures 2016-03-23 08:06:16 +01:00
timer.c ALSA: timer: Use mod_timer() for rearming the system timer 2016-04-01 12:28:16 +02:00
vmaster.c ALSA: core: Use standard printk helpers 2014-02-14 08:14:15 +01:00