OSS-Fuzz: Define ZERO_BUFFERS for MSan build

... and use tj3Alloc() to allocate compression/transformation
destination buffers.

fuzz/build.sh

@@ -9,6 +9,10 @@ if [ $# -ge 1 ]; then
 	FUZZER_SUFFIX="`echo $1 | sed 's/\./_/g'`"
 fi
 
+if [ "$SANITIZER" = "memory" ]; then
+	export CFLAGS="$CFLAGS -DZERO_BUFFERS=1"
+fi
+
 cmake . -DCMAKE_BUILD_TYPE=RelWithDebInfo -DENABLE_STATIC=1 -DENABLE_SHARED=0 \
 	-DCMAKE_C_FLAGS_RELWITHDEBINFO="-g -DNDEBUG" \
 	-DCMAKE_CXX_FLAGS_RELWITHDEBINFO="-g -DNDEBUG" -DCMAKE_INSTALL_PREFIX=$WORK \

fuzz/compress.cc

@@ -1,5 +1,5 @@
 /*
- * Copyright (C)2021, 2023 D. R. Commander.  All Rights Reserved.
+ * Copyright (C)2021, 2023-2024 D. R. Commander.  All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -89,7 +89,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     maxBufSize = tj3JPEGBufSize(width, height, tests[ti].subsamp);
     if (tj3Get(handle, TJPARAM_NOREALLOC)) {
-      if ((dstBuf = (unsigned char *)malloc(maxBufSize)) == NULL)
+      if ((dstBuf = (unsigned char *)tj3Alloc(maxBufSize)) == NULL)
         goto bailout;
     } else
       dstBuf = NULL;

fuzz/compress12.cc

@@ -1,5 +1,5 @@
 /*
- * Copyright (C)2021, 2023 D. R. Commander.  All Rights Reserved.
+ * Copyright (C)2021, 2023-2024 D. R. Commander.  All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -89,7 +89,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     maxBufSize = tj3JPEGBufSize(width, height, tests[ti].subsamp);
     if (tj3Get(handle, TJPARAM_NOREALLOC)) {
-      if ((dstBuf = (unsigned char *)malloc(maxBufSize)) == NULL)
+      if ((dstBuf = (unsigned char *)tj3Alloc(maxBufSize)) == NULL)
         goto bailout;
     } else
       dstBuf = NULL;

fuzz/transform.cc

@@ -1,5 +1,5 @@
 /*
- * Copyright (C)2021-2023 D. R. Commander.  All Rights Reserved.
+ * Copyright (C)2021-2024 D. R. Commander.  All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -70,7 +70,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
   transforms[0].op = TJXOP_NONE;
   transforms[0].options = TJXOPT_PROGRESSIVE | TJXOPT_COPYNONE;
   dstBufs[0] =
-    (unsigned char *)malloc(tj3JPEGBufSize(width, height, jpegSubsamp));
+    (unsigned char *)tj3Alloc(tj3JPEGBufSize(width, height, jpegSubsamp));
   if (!dstBufs[0])
     goto bailout;