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Takashi Iwai 312d02879f ALSA: pcm: Fix endless loop for XRUN recovery in OSS emulation ... commit e15dc99dbb9cf99f6432e8e3c0b3a8f7a3403a86 upstream. The commit 02a5d6925cd3 ("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: 02a5d6925cd3 ("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>		7 years ago
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Makefile	…
copy.c	…
io.c	…
linear.c	…
mixer_oss.c	…
mulaw.c	…
pcm_oss.c	ALSA: pcm: Fix endless loop for XRUN recovery in OSS emulation	7 years ago
pcm_plugin.c	ALSA: pcm: Add missing error checks in OSS emulation plugin builder	7 years ago
pcm_plugin.h	…
rate.c	…
route.c	…