ALSA: pcm: oss: Remove superfluous WARN_ON() for mulaw sanity check

The PCM OSS mulaw plugin has a check of the format of the counter part
whether it's a linear format.  The check is with snd_BUG_ON() that
emits WARN_ON() when the debug config is set, and it confuses
syzkaller as if it were a serious issue.  Let's drop snd_BUG_ON() for
avoiding that.

While we're at it, correct the error code to a more suitable, EINVAL.

Reported-by: syzbot+23b22dc2e0b81cbfcc95@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200901131802.18157-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/oss/mulaw.c b/sound/core/oss/mulaw.c
index 3788906421a73d2b34979fbf4fbfbd33fc8010e8..fe27034f28460e5e09c3f8e9029eec52daf114b9 100644 (file)
--- a/sound/core/oss/mulaw.c
+++ b/sound/core/oss/mulaw.c
@@ -329,8 +329,8 @@ int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *plug,
                snd_BUG();
                return -EINVAL;
        }
-       if (snd_BUG_ON(!snd_pcm_format_linear(format->format)))
-               return -ENXIO;
+       if (!snd_pcm_format_linear(format->format))
+               return -EINVAL;
 
        err = snd_pcm_plugin_build(plug, "Mu-Law<->linear conversion",
                                   src_format, dst_format,