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linux-stable/sound/core
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Takashi Iwai 216f6570d1 ALSA: info: Fix racy addition/deletion of nodes 
commit 8c2f870890 upstream.

The ALSA proc helper manages the child nodes in a linked list, but its
addition and deletion is done without any lock.  This leads to a
corruption if they are operated concurrently.  Usually this isn't a
problem because the proc entries are added sequentially in the driver
probe procedure itself.  But the card registrations are done often
asynchronously, and the crash could be actually reproduced with
syzkaller.

This patch papers over it by protecting the link addition and deletion
with the parent's mutex.  There is "access" mutex that is used for the
file access, and this can be reused for this purpose as well.

Reported-by: syzbot+48df349490c36f9f54ab@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-27 09:35:41 +02:00
..
oss ALSA: pcm: Fix possible OOB access in PCM oss plugins 2019-04-03 06:25:16 +02:00
seq ALSA: seq: Fix OOB-reads from strlcpy 2019-04-17 08:37:50 +02:00
compress_offload.c ALSA: compress: prevent potential divide by zero bugs 2019-03-05 17:57:58 +01:00
control.c ALSA: control: Fix race between adding and removing a user element 2018-12-05 19:41:24 +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 sched/wait: Rename wait_queue_t => wait_queue_entry_t 2017-06-20 12:18:27 +02:00
hwdep_compat.c
info.c ALSA: info: Fix racy addition/deletion of nodes 2019-04-27 09:35:41 +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 snd_interval_refine first/last with open min/max 2018-09-26 08:38:13 +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: check if ops are defined before suspending PCM 2019-04-05 22:31:34 +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 potential Spectre v1 vulnerability 2019-04-03 06:25:16 +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: Fix UBSAN warning at SNDRV_TIMER_IOCTL_NEXT_DEVICE ioctl 2018-07-03 11:25:04 +02:00
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