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dca947d4d2
linux/sound/core
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Takashi Iwai dca947d4d2 ALSA: pcm: Fix races among concurrent read/write and buffer changes 
In the current PCM design, the read/write syscalls (as well as the
equivalent ioctls) are allowed before the PCM stream is running, that
is, at PCM PREPARED state.  Meanwhile, we also allow to re-issue
hw_params and hw_free ioctl calls at the PREPARED state that may
change or free the buffers, too.  The problem is that there is no
protection against those mix-ups.

This patch applies the previously introduced runtime->buffer_mutex to
the read/write operations so that the concurrent hw_params or hw_free
call can no longer interfere during the operation.  The mutex is
unlocked before scheduling, so we don't take it too long.

Cc: <stable@vger.kernel.org>
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20220322170720.3529-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-03-22 20:56:27 +01:00
..
oss Merge branch 'for-next' into for-linus 2022-03-21 16:18:34 +01:00
seq ALSA: seq: oss: fix typo 2022-03-14 07:51:22 +01:00
compress_offload.c ALSA: compress: Initialize mutex in snd_compress_new() 2021-07-15 10:22:38 +02:00
control_compat.c ALSA: ctl: Fix copy of updated id with element read/write 2021-12-02 16:41:07 +01:00
control_led.c ALSA: led: Use restricted type for iface assignment 2021-11-23 18:12:05 +01:00
control.c ALSA: control: Minor optimization for SNDRV_CTL_IOCTL_POWER_STATE 2021-05-25 08:49:06 +02:00
ctljack.c ALSA: Convert strlcpy to strscpy when return value is unused 2021-01-08 09:30:05 +01:00
device.c ALSA: core: Add snd_device_get_state() helper 2020-03-23 18:09:19 +01:00
hrtimer.c ALSA: timer: Replace tasklet with work 2020-09-09 18:32:52 +02:00
hwdep_compat.c ALSA: compat_ioctl: avoid compat_alloc_user_space 2020-09-21 10:37:07 +02:00
hwdep.c ALSA: core: Fix assignment in if condition 2021-06-09 17:30:22 +02:00
info_oss.c ALSA: oss: remove useless NULL check before kfree 2021-12-06 10:08:13 +01:00
info.c proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
init.c ALSA: core: Simplify snd_power_ref_and_wait() with the standard macro 2022-01-19 17:26:04 +01:00
isadma.c ALSA: core: Add device-managed request_dma() 2021-07-19 16:16:34 +02:00
jack.c Merge branch 'for-next' into for-linus 2022-01-05 15:38:34 +01:00
Kconfig ALSA: core: Fix typo in 'PCM Timer Interface' help 2022-03-18 09:19:37 +01:00
Makefile ALSA: memalloc: Unify x86 SG-buffer handling (take#3) 2021-11-16 08:34:29 +01:00
memalloc_local.h ALSA: memalloc: Support for non-contiguous page allocation 2021-10-18 13:32:10 +02:00
memalloc.c ALSA: memalloc: invalidate SG pages before sync 2022-02-10 13:36:53 +01:00
memory.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
misc.c ALSA: core: Fix SSID quirk lookup for subvendor=0 2022-01-17 09:59:32 +01:00
pcm_compat.c ALSA: memalloc: Support for non-contiguous page allocation 2021-10-18 13:32:10 +02:00
pcm_dmaengine.c ASoC: dai_dma: remove slave_id field 2021-12-17 11:23:56 +05:30
pcm_drm_eld.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pcm_iec958.c ALSA: iec958: Split status creation and fill 2021-06-08 17:05:41 +02:00
pcm_lib.c ALSA: pcm: Fix races among concurrent read/write and buffer changes 2022-03-22 20:56:27 +01:00
pcm_local.h ALSA: memalloc: Support for non-contiguous page allocation 2021-10-18 13:32:10 +02:00
pcm_memory.c ALSA: memalloc: Support for non-contiguous page allocation 2021-10-18 13:32:10 +02:00
pcm_misc.c ALSA: pcm: Fix assignment in if condition 2021-06-09 17:30:24 +02:00
pcm_native.c ALSA: pcm: Fix races among concurrent hw_params and hw_free calls 2022-03-22 20:56:07 +01:00
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: timer: Constify snd_timer_hardware definitions 2020-01-03 09:24:07 +01:00
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
pcm.c ALSA: pcm: Fix races among concurrent hw_params and hw_free calls 2022-03-22 20:56:07 +01:00
rawmidi_compat.c ALSA: rawmidi: Add framing mode 2021-05-17 16:02:44 +02:00
rawmidi.c ALSA: rawmidi - fix the uninitalized user_pversion 2021-12-22 20:18:27 +01:00
seq_device.c ALSA: seq: Fix a potential UAF by wrong private_free call order 2021-09-30 14:13:22 +02:00
sound_oss.c ALSA: core: Fix assignment in if condition 2021-06-09 17:30:22 +02:00
sound.c ALSA: core: Fix assignment in if condition 2021-06-09 17:30:22 +02:00
timer_compat.c ALSA: Convert strlcpy to strscpy when return value is unused 2021-01-08 09:30:05 +01:00
timer.c ALSA: timer: Unconditionally unlink slave instances, too 2021-11-05 11:27:27 +01:00
vmaster.c ALSA: Replace the word "slave" in vmaster API 2020-07-20 10:10:47 +02:00