From: Erik de Castro Lopo <erikd@mega-nerd.com>
Date: Tue, 1 Jan 2019 20:11:46 +1100
Subject: src/wav.c: Fix heap read overflow

This is CVE-2018-19758.

Closes: https://github.com/erikd/libsndfile/issues/435
---
 src/wav.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/wav.c b/src/wav.c
index 4b943dc..59015a1 100644
--- src/wav.c
+++ src/wav.c
@@ -1,5 +1,5 @@
 /*
-** Copyright (C) 1999-2016 Erik de Castro Lopo <erikd@mega-nerd.com>
+** Copyright (C) 1999-2019 Erik de Castro Lopo <erikd@mega-nerd.com>
 ** Copyright (C) 2004-2005 David Viens <davidv@plogue.com>
 **
 ** This program is free software; you can redistribute it and/or modify
@@ -1094,6 +1094,8 @@ wav_write_header (SF_PRIVATE *psf, int calc_length)
 		psf_binheader_writef (psf, "44", 0, 0) ; /* SMTPE format */
 		psf_binheader_writef (psf, "44", psf->instrument->loop_count, 0) ;
 
+		/* Loop count is signed 16 bit number so we limit it range to something sensible. */
+		psf->instrument->loop_count &= 0x7fff ;
 		for (tmp = 0 ; tmp < psf->instrument->loop_count ; tmp++)
 		{	int type ;
 
