Commit e15dc99d authored Apr 07, 2018 by Takashi Iwai

ALSA: pcm: Fix endless loop for XRUN recovery in OSS emulation



The commit 02a5d692 ("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: 02a5d692 ("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>

parent b580fbff

sound/core/oss/pcm_oss.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -1128,13 +1128,14 @@ static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_fil
		}

		/* call with params_lock held */
		/* NOTE: this always call PREPARE unconditionally no matter whether
		* runtime->oss.prepare is set or not
		*/
		static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
		{
		int err;
		struct snd_pcm_runtime *runtime = substream->runtime;

		if (!runtime->oss.prepare)
		return 0;
		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
		if (err < 0) {
		pcm_dbg(substream->pcm,

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