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oss/alsa: Do not invoke UB described in 7.15.1.1 

Additional argument (whether to try poll mode) is only passed with
VOICE_ENABLE command.

Thanks to Markus Armbruster for noticing the potential breakage.
This commit is contained in:
malc 2009-10-02 02:37:40 +04:00
parent c227f0995e
commit 301901b56c
2 changed files with 39 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
audio/alsaaudio.c
View File

@ -860,23 +860,26 @@ static int alsa_voice_ctl (snd_pcm_t *handle, const char *typ, int pause)
} }
static int alsa_ctl_out (HWVoiceOut *hw, int cmd, ...) static int alsa_ctl_out (HWVoiceOut *hw, int cmd, ...)
{
ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
switch (cmd) {
case VOICE_ENABLE:
{ {
va_list ap; va_list ap;
int poll_mode; int poll_mode;
ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
va_start (ap, cmd); va_start (ap, cmd);
poll_mode = va_arg (ap, int); poll_mode = va_arg (ap, int);
va_end (ap); va_end (ap);
switch (cmd) {
case VOICE_ENABLE:
ldebug ("enabling voice\n"); ldebug ("enabling voice\n");
if (poll_mode && alsa_poll_out (hw)) { if (poll_mode && alsa_poll_out (hw)) {
poll_mode = 0; poll_mode = 0;
} }
hw->poll_mode = poll_mode; hw->poll_mode = poll_mode;
return alsa_voice_ctl (alsa->handle, "playback", 0); return alsa_voice_ctl (alsa->handle, "playback", 0);
}
case VOICE_DISABLE: case VOICE_DISABLE:
ldebug ("disabling voice\n"); ldebug ("disabling voice\n");

9
audio/ossaudio.c
View File

@ -583,16 +583,18 @@ static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)
static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...) static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
{ {
int trig; int trig;
OSSVoiceOut *oss = (OSSVoiceOut *) hw;
switch (cmd) {
case VOICE_ENABLE:
{
va_list ap; va_list ap;
int poll_mode; int poll_mode;
OSSVoiceOut *oss = (OSSVoiceOut *) hw;
va_start (ap, cmd); va_start (ap, cmd);
poll_mode = va_arg (ap, int); poll_mode = va_arg (ap, int);
va_end (ap); va_end (ap);
switch (cmd) {
case VOICE_ENABLE:
ldebug ("enabling voice\n"); ldebug ("enabling voice\n");
if (poll_mode && oss_poll_out (hw)) { if (poll_mode && oss_poll_out (hw)) {
poll_mode = 0; poll_mode = 0;
@ -612,6 +614,7 @@ static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
); );
return -1; return -1;
} }
}
break; break;
case VOICE_DISABLE: case VOICE_DISABLE: