ALSA: ctxfi - Fix possible buffer pointer overrun

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/sound/pci/ctxfi/ctpcm.c b/sound/pci/ctxfi/ctpcm.c
index a0bd31c6090d..870fa170f046 100644
--- a/sound/pci/ctxfi/ctpcm.c
+++ b/sound/pci/ctxfi/ctpcm.c
@@ -243,6 +243,8 @@ ct_pcm_playback_pointer(struct snd_pcm_substream *substream)
         /* Read out playback position */
         position = atc->pcm_playback_position(atc, apcm);
         position = bytes_to_frames(runtime, position);
+        if (position >= runtime->buffer_size)
+                position = 0;
         return position;
 }
 
@@ -343,6 +345,8 @@ ct_pcm_capture_pointer(struct snd_pcm_substream *substream)
         /* Read out playback position */
         position = atc->pcm_capture_position(atc, apcm);
         position = bytes_to_frames(runtime, position);
+        if (position >= runtime->buffer_size)
+                position = 0;
         return position;
 }