flac: fix out of bound reads due to heap buffer overflow

Fixes: CVE-2020-0499

pkgs/applications/audio/flac/default.nix

···
-{ lib, stdenv, fetchurl, libogg }:
+{ lib, stdenv, fetchurl, fetchpatch, libogg }:
 
 stdenv.mkDerivation rec {
-  name = "flac-1.3.3";
+  pname = "flac";
+  version = "1.3.3";
 
   src = fetchurl {
-    url = "http://downloads.xiph.org/releases/flac/${name}.tar.xz";
+    url = "http://downloads.xiph.org/releases/flac/${pname}-${version}.tar.xz";
     sha256 = "0j0p9sf56a2fm2hkjnf7x3py5ir49jyavg4q5zdyd7bcf6yq4gi1";
   };
+
+  patches = [
+    (fetchpatch {
+      name = "CVE-2020-0499.patch";
+      url = "https://github.com/xiph/flac/commit/2e7931c27eb15e387da440a37f12437e35b22dd4.patch";
+      sha256 = "160qzq9ms5addz7sx06pnyjjkqrffr54r4wd8735vy4x008z71ah";
+    })
+  ];
 
   buildInputs = [ libogg ];