ALSA: timer: Remove kernel warning at compat ioctl error paths

commit 3d4e8303f2c747c8540a0a0126d0151514f6468b upstream.

Some timer compat ioctls have NULL checks of timer instance with
snd_BUG_ON() that bring up WARN_ON() when the debug option is set.
Actually the condition can be met in the normal situation and it's
confusing and bad to spew kernel warnings with stack trace there.
Let's remove snd_BUG_ON() invocation and replace with the simple
checks.  Also, correct the error code to EBADFD to follow the native
ioctl error handling.

Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c
index bfd2b8dd3f8a57ea1e427407b1aee082632e89b9..80343b95b393eeb2f01592de588a1e9c18a5d87a 100644 (file)
--- a/sound/core/timer_compat.c
+++ b/sound/core/timer_compat.c
@@ -40,11 +40,11 @@ static int snd_timer_user_info_compat(struct file *file,
        struct snd_timer *t;
 
        tu = file->private_data;
-       if (snd_BUG_ON(!tu->timeri))
-               return -ENXIO;
+       if (!tu->timeri)
+               return -EBADFD;
        t = tu->timeri->timer;
-       if (snd_BUG_ON(!t))
-               return -ENXIO;
+       if (!t)
+               return -EBADFD;
        memset(&info, 0, sizeof(info));
        info.card = t->card ? t->card->number : -1;
        if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
@@ -73,8 +73,8 @@ static int snd_timer_user_status_compat(struct file *file,
        struct snd_timer_status32 status;
        
        tu = file->private_data;
-       if (snd_BUG_ON(!tu->timeri))
-               return -ENXIO;
+       if (!tu->timeri)
+               return -EBADFD;
        memset(&status, 0, sizeof(status));
        status.tstamp.tv_sec = tu->tstamp.tv_sec;
        status.tstamp.tv_nsec = tu->tstamp.tv_nsec;