The CVE-2018-19758.patch is now a merge of relevant bits from two upstream commits:
42132c543358cee9f7c3e9e9b15bb6c1063a608e
6d7ce94c020cc720a6b28719d1a7879181790008
---
 main/libsndfile/APKBUILD             |  6 ++++--
 main/libsndfile/CVE-2018-19758.patch | 26 ++++++++------------------
 2 files changed, 12 insertions(+), 20 deletions(-)

diff --git a/main/libsndfile/APKBUILD b/main/libsndfile/APKBUILD
index 930040c438..0677a9a9c3 100644
--- a/main/libsndfile/APKBUILD
+++ b/main/libsndfile/APKBUILD
@@ -2,7 +2,7 @@
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=libsndfile
 pkgver=1.0.28
-pkgrel=7
+pkgrel=8
 pkgdesc="A C library for reading and writing files containing sampled sound"
 url="http://www.mega-nerd.com/libsndfile"
 arch="all"
@@ -24,6 +24,8 @@ source="http://www.mega-nerd.com/$pkgname/files/$pkgname-$pkgver.tar.gz
 case $CARCH in arm*) options="!check";; esac
 
 # secfixes:
+#   1.0.28-r8:
+#     - CVE-2018-19758
 #   1.0.28-r7:
 #     - CVE-2018-19758
 #   1.0.28-r6:
@@ -72,5 +74,5 @@ dfd4b5f1c7471fc416eed5c6040580a020543f145de9103751adaad6ce1c5c6a22abc1cf0ffd381a
 814139567d90fb07908014e858c341fe933e04dca69b88ad66078910888237bbeba94f85d9e1489883c424f35fca312eb98c21ae2b122d9289bb6418725cd02e  CVE-2017-12562.patch
 33817e7c85180635fa239e4ea38973b18312878522639f43071188a995f0e1a35dbca6d133555fb0875292b4b609950ae38e747a6b1949f8ae840db9dc3a2805  CVE-2018-13139.patch
 ba3e5321713dbc118f45dac6f86049a15e6ba54fc788776eb267b1b165a0853bec278d8b066c71372cd243c852faa6781bef6a71d108e7cdbc64fb77fa3afc0a  CVE-2017-17456_CVE-2017-17457_CVE-2018-19661_CVE-2018-19662.patch
-0c363859399d7292b5e4c068b7c1e189b2169b0ea8e3ad4181f0a531382c4a94a43ad1e17f420bc0a77ffdd7bc439210c8a06a5bb7baec8709f0bbbabdb4c00e  CVE-2018-19758.patch
+ec90d652056166188ccc360d463d7b5549510aca7fcbbb439dd2d6086f759236ece6091c76d0c7074fb09e7b86df229c39ffdd8c8603b253c33d4d05c42615d2  CVE-2018-19758.patch
 0b7ce6bd6c1ec825521974c36b8c6eb5edd17d3c57d5ae3de287fb34a6be7108bc9511abb497538eef36e5883b84f4137fad6fe9a1d150345111de9f068838f9  fix-rf64-varargs-bug.patch"
diff --git a/main/libsndfile/CVE-2018-19758.patch b/main/libsndfile/CVE-2018-19758.patch
index ead28f6fd2..7b4e9477bb 100644
--- a/main/libsndfile/CVE-2018-19758.patch
+++ b/main/libsndfile/CVE-2018-19758.patch
@@ -1,23 +1,13 @@
-commit 42132c543358cee9f7c3e9e9b15bb6c1063a608e
-Author: Erik de Castro Lopo <erikd@mega-nerd.com>
-Date:   Tue Jan 1 20:11:46 2019 +1100
-
-    src/wav.c: Fix heap read overflow
-    
-    This is CVE-2018-19758.
-    
-    Closes: https://github.com/erikd/libsndfile/issues/435
-
-diff --git a/src/wav.c b/src/wav.c
-index 9d71aadb..5c825f2a 100644
---- a/src/wav.c
+--- a/src/wav.c.orig
 +++ b/src/wav.c
-@@ -1146,6 +1146,8 @@ wav_write_header (SF_PRIVATE *psf, int calc_length)
- 		psf_binheader_writef (psf, "44", BHW4 (0), BHW4 (0)) ; /* SMTPE format */
- 		psf_binheader_writef (psf, "44", BHW4 (psf->instrument->loop_count), BHW4 (0)) ;
+@@ -1094,6 +1094,10 @@
+ 		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 ;
++		/* Make sure we don't read past the loops array end. */
++		if (psf->instrument->loop_count > ARRAY_LEN (psf->instrument->loops))
++			psf->instrument->loop_count = ARRAY_LEN (psf->instrument->loops) ;
++
  		for (tmp = 0 ; tmp < psf->instrument->loop_count ; tmp++)
  		{	int type ;
  
-- 
2.21.0




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