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ALSA: ctxfi - Fix possible buffer pointer overrun

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Fix possible buffer pointer overruns.  Back to zero when it's equal
or over the buffer size.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-06-08 15:07:46 +02:00
parent 514eef9c2a
commit af8500bbbd
1 changed files with 4 additions and 0 deletions
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4
sound/pci/ctxfi/ctpcm.c
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@ -243,6 +243,8 @@ ct_pcm_playback_pointer(struct snd_pcm_substream *substream)
/* Read out playback position */ /* Read out playback position */
position = atc->pcm_playback_position(atc, apcm); position = atc->pcm_playback_position(atc, apcm);
position = bytes_to_frames(runtime, position); position = bytes_to_frames(runtime, position);
if (position >= runtime->buffer_size)
position = 0;
return position; return position;
} }
@ -343,6 +345,8 @@ ct_pcm_capture_pointer(struct snd_pcm_substream *substream)
/* Read out playback position */ /* Read out playback position */
position = atc->pcm_capture_position(atc, apcm); position = atc->pcm_capture_position(atc, apcm);
position = bytes_to_frames(runtime, position); position = bytes_to_frames(runtime, position);
if (position >= runtime->buffer_size)
position = 0;
return position; return position;
} }