ALSA: pcm: oss: Remove WARNING from snd_pcm_plug_alloc() checks

The return value checks in snd_pcm_plug_alloc() are covered with
snd_BUG_ON() macro that may trigger a kernel WARNING depending on the
kconfig.  But since the error condition can be triggered by a weird
user space parameter passed to OSS layer, we shouldn't give the kernel
stack trace just for that.  As it's a normal error condition, let's
remove snd_BUG_ON() macro usage there.

Reported-by: syzbot+2a59ee7a9831b264f45e@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200312155730.7520-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/oss/pcm_plugin.c b/sound/core/oss/pcm_plugin.c
index c9401832967c3c5e0382bc7c472f8be772064830..752d078908e9d017ad633da45c052e22c6ba9b25 100644 (file)
--- a/sound/core/oss/pcm_plugin.c
+++ b/sound/core/oss/pcm_plugin.c
@@ -111,7 +111,7 @@ int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
                while (plugin->next) {
                        if (plugin->dst_frames)
                                frames = plugin->dst_frames(plugin, frames);
-                       if (snd_BUG_ON((snd_pcm_sframes_t)frames <= 0))
+                       if ((snd_pcm_sframes_t)frames <= 0)
                                return -ENXIO;
                        plugin = plugin->next;
                        err = snd_pcm_plugin_alloc(plugin, frames);
@@ -123,7 +123,7 @@ int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
                while (plugin->prev) {
                        if (plugin->src_frames)
                                frames = plugin->src_frames(plugin, frames);
-                       if (snd_BUG_ON((snd_pcm_sframes_t)frames <= 0))
+                       if ((snd_pcm_sframes_t)frames <= 0)
                                return -ENXIO;
                        plugin = plugin->prev;
                        err = snd_pcm_plugin_alloc(plugin, frames);