Takashi Iwai 312d02879f ALSA: pcm: Fix endless loop for XRUN recovery in OSS emulation ... commit e15dc99dbb upstream. The commit 02a5d6925c ("ALSA: pcm: Avoid potential races between OSS ioctls and read/write") split the PCM preparation code to a locked version, and it added a sanity check of runtime->oss.prepare flag along with the change. This leaded to an endless loop when the stream gets XRUN: namely, snd_pcm_oss_write3() and co call snd_pcm_oss_prepare() without setting runtime->oss.prepare flag and the loop continues until the PCM state reaches to another one. As the function is supposed to execute the preparation unconditionally, drop the invalid state check there. The bug was triggered by syzkaller. Fixes: 02a5d6925c ("ALSA: pcm: Avoid potential races between OSS ioctls and read/write") Reported-by: syzbot+150189c103427d31a053@syzkaller.appspotmail.com Reported-by: syzbot+7e3f31a52646f939c052@syzkaller.appspotmail.com Reported-by: syzbot+4f2016cf5185da7759dc@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>		2018-04-24 09:36:35 +02:00
..
copy.c	ALSA: Kill snd_assert() in sound/core/*	2008-08-13 11:46:35 +02:00
io.c	ALSA: pcm: Build OSS writev/readv helpers conditionally	2017-06-02 19:38:26 +02:00
linear.c	ALSA: core: remove unused variables.	2011-05-26 08:19:04 +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
mixer_oss.c	ALSA: core: Follow standard EXPORT_SYMBOL() declarations	2017-06-16 16:19:16 +02:00
mulaw.c	ALSA: core: sparse cleanups	2011-02-14 17:10:11 +01:00
pcm_oss.c	ALSA: pcm: Fix endless loop for XRUN recovery in OSS emulation	2018-04-24 09:36:35 +02:00
pcm_plugin.c	ALSA: pcm: Add missing error checks in OSS emulation plugin builder	2018-01-17 09:45:20 +01:00
pcm_plugin.h	ALSA: pcm: Build OSS writev/readv helpers conditionally	2017-06-02 19:38:26 +02:00
rate.c	ALSA: fix excessive background noise introduced by OSS emulation rate shrink	2009-02-23 07:49:04 +01:00
route.c	ALSA: core: sparse cleanups	2011-02-14 17:10:11 +01:00