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1f20f9ff57
linux/sound
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Takashi Iwai 1f20f9ff57 ALSA: seq: Fix nested rwsem annotation for lockdep splat 
syzkaller reported the lockdep splat due to the possible deadlock of
grp->list_mutex of each sequencer client object.  Actually this is
rather a false-positive report due to the missing nested lock
annotations.  The sequencer client may deliver the event directly to
another client which takes another own lock.

For addressing this issue, this patch replaces the simple down_read()
with down_read_nested().  As a lock subclass, the already existing
"hop" can be re-used, which indicates the depth of the call.

Reference: http://lkml.kernel.org/r/089e082686ac9b482e055c832617@google.com
Reported-by: syzbot <bot+7feb8de6b4d6bf810cf098bef942cc387e79d0ad@syzkaller.appspotmail.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-10-31 09:09:10 +01:00
..
aoa ALSA: aoa: Convert to using %pOF instead of full_name 2017-08-29 14:52:17 +02:00
arm ALSA: aaci: constify ac97_pcm structures 2017-08-23 15:53:37 +02:00
atmel ASoC: Updates for v4.14 2017-09-04 14:50:49 +02:00
core ALSA: seq: Fix nested rwsem annotation for lockdep splat 2017-10-31 09:09:10 +01:00
drivers ALSA: vx: Put missing KERN_CONT prefix 2017-08-31 11:01:17 +02:00
firewire ALSA: firewire: Use common error handling code in snd_motu_stream_start_duplex() 2017-09-12 09:23:26 +02:00
hda ALSA: hda: Abort capability probe at invalid register read 2017-10-18 12:26:44 +02:00
i2c ALSA: ak411x: Use array instead of offsetof() 2017-05-17 07:13:03 +02:00
isa ALSA: isa: make snd_pcm_hardware const 2017-08-17 12:44:11 +02:00
mips ALSA: mips: constify snd_pcm_ops structures 2017-08-19 11:02:18 +02:00
oss vfs: constify path argument to kernel_read_file_from_path 2017-09-14 20:18:45 -07:00
parisc sound updates for 4.14-rc1 2017-09-07 12:44:53 -07:00
pci ALSA: hda - fix headset mic problem for Dell machines with alc236 2017-10-24 14:32:24 +02:00
pcmcia ALSA: pcmcia: constify snd_pcm_ops structures 2017-08-19 11:02:21 +02:00
ppc ALSA: ppc: constify snd_pcm_ops structures 2017-08-19 11:02:22 +02:00
sh ALSA: sh: Put missing KERN_* prefix 2017-08-31 11:02:15 +02:00
soc dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
sparc ALSA: sparc: constify snd_pcm_ops structures 2017-08-19 11:02:24 +02:00
spi ALSA: spi: constify snd_pcm_ops structures 2017-08-19 11:02:26 +02:00
synth ALSA: emux: Delete two error messages for a failed memory allocation in snd_emux_create_port() 2017-08-10 17:55:13 +02:00
usb ALSA: usb-audio: Add native DSD support for Pro-Ject Pre Box S2 Digital 2017-10-16 13:34:55 +02:00
x86 main drm pull for v4.13 2017-07-09 18:48:37 -07:00
ac97_bus.c
Kconfig ALSA: synth: Select snd-emux-synth explicitly 2017-06-09 22:10:06 +02:00
last.c
Makefile
sound_core.c