From: David Bryant <david@wavpack.com>
Date: Tue, 24 Apr 2018 17:27:01 -0700
Subject: [PATCH] issue #33, sanitize size of unknown chunks before malloc()


diff --git a/cli/dsdiff.c b/cli/dsdiff.c
index c016df9..fa56bbb 100644
--- a/cli/dsdiff.c
+++ b/cli/dsdiff.c
@@ -279,7 +279,14 @@ int ParseDsdiffHeaderConfig (FILE *infile, char *infilename, char *fourcc, Wavpa
         else {          // just copy unknown chunks to output file
 
             int bytes_to_copy = (int)(((dff_chunk_header.ckDataSize) + 1) & ~(int64_t)1);
-            char *buff = malloc (bytes_to_copy);
+            char *buff;
+
+            if (bytes_to_copy < 0 || bytes_to_copy > 4194304) {
+                error_line ("%s is not a valid .DFF 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",
diff --git a/cli/riff.c b/cli/riff.c
index de98c1e..7bddf63 100644
--- a/cli/riff.c
+++ b/cli/riff.c
@@ -286,7 +286,14 @@ int ParseRiffHeaderConfig (FILE *infile, char *infilename, char *fourcc, Wavpack
         else {          // just copy unknown chunks to output file
 
             int bytes_to_copy = (chunk_header.ckSize + 1) & ~1L;
-            char *buff = malloc (bytes_to_copy);
+            char *buff;
+
+            if (bytes_to_copy < 0 || bytes_to_copy > 4194304) {
+                error_line ("%s is not a valid .WAV 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",
diff --git a/cli/wave64.c b/cli/wave64.c
index 591d640..fa928a0 100644
--- a/cli/wave64.c
+++ b/cli/wave64.c
@@ -241,7 +241,14 @@ int ParseWave64HeaderConfig (FILE *infile, char *infilename, char *fourcc, Wavpa
         }
         else {          // just copy unknown chunks to output file
             int bytes_to_copy = (chunk_header.ckSize + 7) & ~7L;
-            char *buff = malloc (bytes_to_copy);
+            char *buff;
+
+            if (bytes_to_copy < 0 || bytes_to_copy > 4194304) {
+                error_line ("%s is not a valid .W64 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",