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ALSA: pcm: Add missing error checks in OSS emulation plugin builder

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commit 6708913750344a900f2e73bfe4a4d6dbbce4fe8d upstream.

In the OSS emulation plugin builder where the frame size is parsed in
the plugin chain, some places miss the possible errors returned from
the plugin src_ or dst_frames callback.

This patch papers over such places.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2018-01-04 16:39:27 +01:00 committed by Greg Kroah-Hartman
parent 3074fe070a
commit 1ee7bc5526
1 changed files with 11 additions and 3 deletions
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14
sound/core/oss/pcm_plugin.c
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@ -591,18 +591,26 @@ snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *plug, st
snd_pcm_sframes_t frames = size;
plugin = snd_pcm_plug_first(plug);
while (plugin && frames > 0) {
while (plugin) {
if (frames <= 0)
return frames;
if ((next = plugin->next) != NULL) {
snd_pcm_sframes_t frames1 = frames;
if (plugin->dst_frames)
if (plugin->dst_frames) {
frames1 = plugin->dst_frames(plugin, frames);
if (frames1 <= 0)
return frames1;
}
if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
return err;
}
if (err != frames1) {
frames = err;
if (plugin->src_frames)
if (plugin->src_frames) {
frames = plugin->src_frames(plugin, frames1);
if (frames <= 0)
return frames;
}
}
} else
dst_channels = NULL;