From c47268866361d7a66566b8205fe677f9b81f87b0 Mon Sep 17 00:00:00 2001
From: Themaister <maister@archlinux.us>
Date: Mon, 24 Sep 2012 16:40:51 +0200
Subject: [PATCH] Do not segfault when snd_pcm_avail_update() fails.

---
 audio/alsa.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/audio/alsa.c b/audio/alsa.c
index d9160de439..512045ecb3 100644
--- a/audio/alsa.c
+++ b/audio/alsa.c
@@ -223,7 +223,15 @@ static void alsa_free(void *data)
 static size_t alsa_write_avail(void *data)
 {
    alsa_t *alsa = (alsa_t*)data;
-   return snd_pcm_frames_to_bytes(alsa->pcm, snd_pcm_avail_update(alsa->pcm));
+
+   snd_pcm_sframes_t avail = snd_pcm_avail_update(alsa->pcm);
+   if (avail < 0)
+   {
+      RARCH_WARN("[ALSA]: avail_update() failed: %s\n", snd_strerror(avail));
+      return alsa->buffer_size;
+   }
+
+   return snd_pcm_frames_to_bytes(alsa->pcm, avail);
 }
 
 static size_t alsa_buffer_size(void *data)