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ALSA: pcm: Remove WARN_ON() at snd_pcm_hw_params() error

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snd_pcm_hw_params() (more exactly snd_pcm_hw_params_choose()) contains
a check of the return error from snd_pcm_hw_param_first() and _last()
with snd_BUG_ON() -- i.e. it may trigger WARN_ON() depending on the
kconfig.

This was a valid check in the past, as these functions shouldn't
return any error if the parameters have been already refined via
snd_pcm_hw_refine() beforehand.  However, the recent rewrite
introduced a kmalloc() in snd_pcm_hw_refine() for removing VLA, and
this brought a possibility to trigger an error.  As a result, syzbot
caught lots of superfluous kernel WARN_ON() and paniced via fault
injection.

As the WARN_ON() is no longer valid with the introduction of
kmalloc(), let's drop snd_BUG_ON() check, in order to make the world
peaceful place again.

Reported-by: syzbot+803e0047ac3a3096bb4f@syzkaller.appspotmail.com
Fixes: 5730f9f744 ("ALSA: pcm: Remove VLA usage")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2018-04-09 17:12:16 +02:00
parent e15dc99dbb
commit e1a3a981e3
1 changed files with 1 additions and 1 deletions
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2
sound/core/pcm_native.c
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@ -617,7 +617,7 @@ static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
else
changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
if (snd_BUG_ON(changed < 0))
if (changed < 0)
return changed;
if (changed == 0)
continue;