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| author | Takashi Iwai <tiwai@suse.de> | 2017-01-04 12:19:15 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-01-04 18:01:35 +0100 |
| commit | 874e1f6fad9a5184b67f4cee37c1335cd2cc5677 (patch) | |
| tree | 352304fa4287e1d7d9b5522f46f26fc8c92dcf9d /sound/drivers/vx/vx_pcm.c | |
| parent | ab949d519601880fd46e8bc1445d6a453bf2dc09 (diff) | |
| download | linux-874e1f6fad9a5184b67f4cee37c1335cd2cc5677.tar.bz2 | |
ALSA: vx: Fix possible transfer overflow
The pseudo DMA transfer codes in VX222 and VX-pocket driver have a
slight bug where they check the buffer boundary wrongly, and may
overflow. Also, the zero sample count might be handled badly for the
playback (although it shouldn't happen in theory). This patch
addresses these issues.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=141541
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/drivers/vx/vx_pcm.c')
| -rw-r--r-- | sound/drivers/vx/vx_pcm.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sound/drivers/vx/vx_pcm.c b/sound/drivers/vx/vx_pcm.c index 11467272089e..41a617886cc7 100644 --- a/sound/drivers/vx/vx_pcm.c +++ b/sound/drivers/vx/vx_pcm.c @@ -1048,8 +1048,10 @@ static void vx_pcm_capture_update(struct vx_core *chip, struct snd_pcm_substream /* ok, let's accelerate! */ int align = pipe->align * 3; space = (count / align) * align; - vx_pseudo_dma_read(chip, runtime, pipe, space); - count -= space; + if (space > 0) { + vx_pseudo_dma_read(chip, runtime, pipe, space); + count -= space; + } } /* read the rest of bytes */ while (count > 0) { |