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Commit 7153a558 authored by Takashi Iwai's avatar Takashi Iwai Committed by Jaroslav Kysela
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[ALSA] pcm - Fix zero-division in 32bit compat layer 



PCM Midlevel
Fixed zero-division bug in PCM 32bit compat layer.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent e0c93cf3

sound/core/pcm_compat.c

+8 −3
Original line number Diff line number Diff line
@@ -144,7 +144,7 @@ static int snd_pcm_ioctl_sw_params_compat(snd_pcm_substream_t *substream, 
	err = snd_pcm_sw_params(substream, &params);

	if (err < 0)

		return err;

	if (put_user(boundary, &src->boundary))

	if (boundary && put_user(boundary, &src->boundary))

		return -EFAULT;

	return err;

}
@@ -252,8 +252,11 @@ static int snd_pcm_ioctl_hw_params_compat(snd_pcm_substream_t *substream, 
		goto error;

	}



	if (! refine)

		runtime->boundary = recalculate_boundary(runtime);

	if (! refine) {

		unsigned int new_boundary = recalculate_boundary(runtime);

		if (new_boundary)

			runtime->boundary = new_boundary;

	}

 error:

	kfree(data);

	return err;
@@ -408,6 +411,8 @@ static int snd_pcm_ioctl_sync_ptr_compat(snd_pcm_substream_t *substream, 
	status = runtime->status;

	control = runtime->control;

	boundary = recalculate_boundary(runtime);

	if (! boundary)

		boundary = 0x7fffffff;

	snd_pcm_stream_lock_irq(substream);

	/* FIXME: we should consider the boundary for the sync from app */

	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))