From: Jaroslav Kysela <perex@perex.cz>
Date: Tue, 16 May 2023 06:57:31 +0000 (+0200)
Subject: pcm: hw - prevent divide by zero for broken apps
X-Git-Tag: v1.2.10~50
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=3661bdae35961e4a4dd67a60682550e30b878207;p=alsa-lib.git

pcm: hw - prevent divide by zero for broken apps

Fixes: https://github.com/alsa-project/alsa-lib/issues/318
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/src/pcm/pcm_hw.c b/src/pcm/pcm_hw.c
index 8ffebed9..26ff62c2 100644
--- a/src/pcm/pcm_hw.c
+++ b/src/pcm/pcm_hw.c
@@ -742,6 +742,9 @@ static int snd_pcm_hw_drain(snd_pcm_t *pcm)
 
 	if (pcm->stream != SND_PCM_STREAM_PLAYBACK)
 		goto __skip_silence;
+	/* stream probably in SETUP, prevent divide by zero */
+	if (pcm->period_size == 0)
+		goto __skip_silence;
 	if (hw->drain_silence == 0 || hw->perfect_drain)
 		goto __skip_silence;
 	snd_pcm_sw_params_current_no_lock(pcm, &sw_params);