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ALSA: timer - Fix Oops at closing slave timer
A slave-timer instance has no timer reference, and this results in NULL-dereference at stopping the timer, typically called at closing the device. Reference: https://bugzilla.kernel.org/show_bug.cgi?id=40682 Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -531,6 +531,8 @@ int snd_timer_stop(struct snd_timer_instance *timeri)
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if (err < 0)
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return err;
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timer = timeri->timer;
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if (!timer)
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return -EINVAL;
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spin_lock_irqsave(&timer->lock, flags);
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timeri->cticks = timeri->ticks;
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timeri->pticks = 0;
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