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ossaudio: prevent SIGSEGV in oss_enable_out 

With audiodev parameter out.mixing-engine=off hw->mix_buf is
NULL. This patch reverts a small part of dc88e38fa7 "audio:
unify input and output mixeng buffer management".

To reproduce the problem start qemu with
-audiodev oss,id=audio0,try-mmap=on,out.mixing-engine=off

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20200123074943.6699-6-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2020-01-23 08:49:40 +01:00 committed by Gerd Hoffmann
parent fdc8c5f471
commit 3e0c1bbab5
1 changed files with 1 additions and 1 deletions
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2
audio/ossaudio.c
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@ -592,7 +592,7 @@ static void oss_enable_out(HWVoiceOut *hw, bool enable)
return;
}
audio_pcm_info_clear_buf(&hw->info, hw->buf_emul, hw->mix_buf->size);
audio_pcm_info_clear_buf(&hw->info, hw->buf_emul, hw->samples);
trig = PCM_ENABLE_OUTPUT;
if (ioctl(oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
oss_logerr(errno,