Fix CVE-2018-7254:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7254

Copied from upstream:
https://github.com/dbry/WavPack/commit/8e3fe45a7bac31d9a3b558ae0079e2d92a04799e

diff --git a/cli/caff.c b/cli/caff.c
index ae57c4b..6248a71 100644
--- a/cli/caff.c
+++ b/cli/caff.c
@@ -89,8 +89,8 @@ typedef struct
 
 #define CAFChannelDescriptionFormat "LLLLL"
 
-static const char TMH_full [] = { 1,2,3,13,9,10,5,6,12,14,15,16,17,9,4,18,7,8,19,20,21 };
-static const char TMH_std [] = { 1,2,3,11,8,9,5,6,10,12,13,14,15,7,4,16 };
+static const char TMH_full [] = { 1,2,3,13,9,10,5,6,12,14,15,16,17,9,4,18,7,8,19,20,21,0 };
+static const char TMH_std [] = { 1,2,3,11,8,9,5,6,10,12,13,14,15,7,4,16,0 };
 
 static struct {
     uint32_t mChannelLayoutTag;     // Core Audio layout, 100 - 146 in high word, num channels in low word
@@ -274,10 +274,19 @@ int ParseCaffHeaderConfig (FILE *infile, char *infilename, char *fourcc, Wavpack
             }
         }
         else if (!strncmp (caf_chunk_header.mChunkType, "chan", 4)) {
-            CAFChannelLayout *caf_channel_layout = malloc ((size_t) caf_chunk_header.mChunkSize);
+            CAFChannelLayout *caf_channel_layout;
 
-            if (caf_chunk_header.mChunkSize < sizeof (CAFChannelLayout) ||
-                !DoReadFile (infile, caf_channel_layout, (uint32_t) caf_chunk_header.mChunkSize, &bcount) ||
+            if (caf_chunk_header.mChunkSize < sizeof (CAFChannelLayout) || caf_chunk_header.mChunkSize > 1024) {
+                error_line ("this .CAF file has an invalid 'chan' chunk!");
+                return WAVPACK_SOFT_ERROR;
+            }
+
+            if (debug_logging_mode)
+                error_line ("'chan' chunk is %d bytes", (int) caf_chunk_header.mChunkSize);
+
+            caf_channel_layout = malloc ((size_t) caf_chunk_header.mChunkSize);
+
+            if (!DoReadFile (infile, caf_channel_layout, (uint32_t) caf_chunk_header.mChunkSize, &bcount) ||
                 bcount != caf_chunk_header.mChunkSize) {
                     error_line ("%s is not a valid .CAF file!", infilename);
                     free (caf_channel_layout);
@@ -495,8 +504,15 @@ int ParseCaffHeaderConfig (FILE *infile, char *infilename, char *fourcc, Wavpack
         }
         else {          // just copy unknown chunks to output file
 
-            int bytes_to_copy = (uint32_t) caf_chunk_header.mChunkSize;
-            char *buff = malloc (bytes_to_copy);
+            uint32_t bytes_to_copy = (uint32_t) caf_chunk_header.mChunkSize;
+            char *buff;
+
+            if (caf_chunk_header.mChunkSize < 0 || caf_chunk_header.mChunkSize > 1048576) {
+                error_line ("%s is not a valid .CAF file!", infilename);
+                return WAVPACK_SOFT_ERROR;
+            }
+
+            buff = malloc (bytes_to_copy);
 
             if (debug_logging_mode)
                 error_line ("extra unknown chunk \"%c%c%c%c\" of %d bytes",
tle='2018-09-21 15:03:48 +0200'>2018-09-21</span></td><td><a href='/guix/commit/gnu/packages/kodi.scm?id=2aa137e261984b9762de5221459835eefb165fe7'>gnu: crossguid: Use INVOKE.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-07-16 11:02:25 +0300'>2018-07-16</span></td><td><a href='/guix/commit/gnu/packages/kodi.scm?id=66b9c643d5146f193182cd9ec5cf414aa6874b8c'>gnu: kodi: Build with mariadb.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-03-14 17:37:20 +0100'>2018-03-14</span></td><td><a href='/guix/commit/gnu/packages/kodi.scm?id=8c72ed923d77ee55989965bb02628043799b9548'>Merge branch 'master' into core-updates</a></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-03-11 22:04:40 +0100'>2018-03-11</span></td><td><a href='/guix/commit/gnu/packages/kodi.scm?id=189be331acfda1c242a9c85fca8d2a0356742f48'>build-system/gnu: Add 'bootstrap' phase.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-02-25 18:35:25 +0100'>2018-02-25</span></td><td><a href='/guix/commit/gnu/packages/kodi.scm?id=9d2749f62f1479d2d88cb8270fb20ba2bb146b33'>gnu: kodi: Update to 18.0_alpha-8.ec16dbc.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-11-20 00:17:39 +0100'>2017-11-20</span></td><td><a href='/guix/commit/gnu/packages/kodi.scm?id=08cc0ef096ea37d0936b3e2ba2df693aaf52729a'>gnu: kodi: Update snapshot.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-11-03 06:46:03 +0300'>2017-11-03</span></td><td><a href='/guix/commit/gnu/packages/kodi.scm?id=72df48dbad95c3bc70a2962f496420ce3363d0de'>gnu: Add kodi-cli.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>