From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 8 Jun 2009 13:07:46 +0000 (+0200)
Subject: ALSA: ctxfi - Fix possible buffer pointer overrun
X-Git-Tag: firefly_0821_release~13628^2~4^2~11
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=af8500bbbd18438495d2f91ad07bda49fff3b770;p=firefly-linux-kernel-4.4.55.git

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>
---

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;
 }