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platform_kernel-5.15
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Revert "ALSA: pcm: Fix races among concurrent read/write and buffer changes" 

This reverts commit 47711ff10c.

It will come back after the next ABI break as it is needed to resolve
CVE-2022-1048.  But for now, while testing, it can be reverted in order
to preserve the ABI.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I5d4a52d443cffa34c8550b83c90d11a69da09cfc
This commit is contained in:
Greg Kroah-Hartman 2022-03-29 12:55:16 +02:00
parent f9e40dc812
commit 9f368dfefd
1 changed files with 0 additions and 4 deletions
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4
sound/core/pcm_lib.c
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@ -1905,11 +1905,9 @@ static int wait_for_avail(struct snd_pcm_substream *substream,
if (avail >= runtime->twake)
break;
snd_pcm_stream_unlock_irq(substream);
mutex_unlock(&runtime->buffer_mutex);
tout = schedule_timeout(wait_time);
mutex_lock(&runtime->buffer_mutex);
snd_pcm_stream_lock_irq(substream);
set_current_state(TASK_INTERRUPTIBLE);
switch (runtime->status->state) {
@ -2203,7 +2201,6 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
nonblock = !!(substream->f_flags & O_NONBLOCK);
mutex_lock(&runtime->buffer_mutex);
snd_pcm_stream_lock_irq(substream);
err = pcm_accessible_state(runtime);
if (err < 0)
@ -2291,7 +2288,6 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
if (xfer > 0 && err >= 0)
snd_pcm_update_state(substream, runtime);
snd_pcm_stream_unlock_irq(substream);
mutex_unlock(&runtime->buffer_mutex);
return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
}
EXPORT_SYMBOL(__snd_pcm_lib_xfer);