This is a note to let you know that I've just added the patch titled
ALSA: pcm: oss: Place the plugin buffer overflow checks correctly
to the 5.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-pcm-oss-place-the-plugin-buffer-overflow-checks.patch
and it can be found in the queue-5.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit dd56f87f7585af86675d23361b0826f6a787e572
Author: Takashi Iwai <tiwai@xxxxxxx>
Date: Fri Apr 24 21:33:50 2020 +0200
ALSA: pcm: oss: Place the plugin buffer overflow checks correctly
commit 4285de0725b1bf73608abbcd35ad7fd3ddc0b61e upstream.
The checks of the plugin buffer overflow in the previous fix by commit
f2ecf903ef06 ("ALSA: pcm: oss: Avoid plugin buffer overflow")
are put in the wrong places mistakenly, which leads to the expected
(repeated) sound when the rate plugin is involved. Fix in the right
places.
Also, at those right places, the zero check is needed for the
termination node, so added there as well, and let's get it done,
finally.
Fixes: f2ecf903ef06 ("ALSA: pcm: oss: Avoid plugin buffer overflow")
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200424193350.19678-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/sound/core/oss/pcm_plugin.c b/sound/core/oss/pcm_plugin.c
index 50c35ecc8953f..d1760f86773c9 100644
--- a/sound/core/oss/pcm_plugin.c
+++ b/sound/core/oss/pcm_plugin.c
@@ -211,21 +211,23 @@ static snd_pcm_sframes_t plug_client_size(struct snd_pcm_substream *plug,
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
plugin = snd_pcm_plug_last(plug);
while (plugin && drv_frames > 0) {
- if (check_size && drv_frames > plugin->buf_frames)
- drv_frames = plugin->buf_frames;
plugin_prev = plugin->prev;
if (plugin->src_frames)
drv_frames = plugin->src_frames(plugin, drv_frames);
+ if (check_size && plugin->buf_frames &&
+ drv_frames > plugin->buf_frames)
+ drv_frames = plugin->buf_frames;
plugin = plugin_prev;
}
} else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
plugin = snd_pcm_plug_first(plug);
while (plugin && drv_frames > 0) {
plugin_next = plugin->next;
+ if (check_size && plugin->buf_frames &&
+ drv_frames > plugin->buf_frames)
+ drv_frames = plugin->buf_frames;
if (plugin->dst_frames)
drv_frames = plugin->dst_frames(plugin, drv_frames);
- if (check_size && drv_frames > plugin->buf_frames)
- drv_frames = plugin->buf_frames;
plugin = plugin_next;
}
} else
@@ -251,26 +253,28 @@ static snd_pcm_sframes_t plug_slave_size(struct snd_pcm_substream *plug,
plugin = snd_pcm_plug_first(plug);
while (plugin && frames > 0) {
plugin_next = plugin->next;
+ if (check_size && plugin->buf_frames &&
+ frames > plugin->buf_frames)
+ frames = plugin->buf_frames;
if (plugin->dst_frames) {
frames = plugin->dst_frames(plugin, frames);
if (frames < 0)
return frames;
}
- if (check_size && frames > plugin->buf_frames)
- frames = plugin->buf_frames;
plugin = plugin_next;
}
} else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
plugin = snd_pcm_plug_last(plug);
while (plugin) {
- if (check_size && frames > plugin->buf_frames)
- frames = plugin->buf_frames;
plugin_prev = plugin->prev;
if (plugin->src_frames) {
frames = plugin->src_frames(plugin, frames);
if (frames < 0)
return frames;
}
+ if (check_size && plugin->buf_frames &&
+ frames > plugin->buf_frames)
+ frames = plugin->buf_frames;
plugin = plugin_prev;
}
} else
