ALSA: timer - Add NULL-check for invalid slave timer

Just to be sure.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 950eed0c098e69e128f0ce8448a2a6f4c5fb7bca..67ebf1c21c043a61dc0b51012f00778612af7b45 100644 (file)
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -328,6 +328,8 @@ int snd_timer_close(struct snd_timer_instance *timeri)
                mutex_unlock(&register_mutex);
        } else {
                timer = timeri->timer;
+               if (snd_BUG_ON(!timer))
+                       goto out;
                /* wait, until the active callback is finished */
                spin_lock_irq(&timer->lock);
                while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) {
@@ -353,6 +355,7 @@ int snd_timer_close(struct snd_timer_instance *timeri)
                }
                mutex_unlock(&register_mutex);
        }
+ out:
        if (timeri->private_free)
                timeri->private_free(timeri);
        kfree(timeri->owner);