From f894f24bcd63dc8b2a0604a9b659dd95aebbb384 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Sun, 20 Sep 2009 21:19:37 +0000
Subject: Avoid possible overflow due to base note offset.

Subversion-branch: /branches/opl-branch
Subversion-revision: 1683
---
 src/i_oplmusic.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src')

diff --git a/src/i_oplmusic.c b/src/i_oplmusic.c
index de126c63..aa079614 100644
--- a/src/i_oplmusic.c
+++ b/src/i_oplmusic.c
@@ -934,6 +934,13 @@ static unsigned int FrequencyForVoice(opl_voice_t *voice)
     gm_voice = &voice->current_instr->voices[voice->current_instr_voice];
     note += (signed short) SHORT(gm_voice->base_note_offset);
 
+    // Avoid possible overflow due to base note offset:
+
+    if (note > 0x7f)
+    {
+        note = voice->note;
+    }
+
     freq_index = 64 + 32 * note + voice->channel->bend;
 
     // If this is the second voice of a double voice instrument, the
-- 
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