Check that dest is valid for decompression (#3555)

* add check for valid dest buffer and fuzz on random dest ptr when malloc 0

* add uptrval to linux-kernel

* remove bin files

* get rid of uptrval

* restrict max pointer value check to platforms where sizeof(size_t) == sizeof(void*)

tests/fuzz/fuzz_helpers.h

@@ -19,6 +19,7 @@
 #include "fuzz.h"
 #include "xxhash.h"
 #include "zstd.h"
+#include "fuzz_data_producer.h"
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -62,6 +63,12 @@ extern "C" {
  */
 void* FUZZ_malloc(size_t size);
 
+/**
+ * malloc except returns random pointer for zero sized data and FUZZ_ASSERT
+ * that malloc doesn't fail.
+ */
+void* FUZZ_malloc_rand(size_t size,  FUZZ_dataProducer_t *producer);
+
 /**
  * memcmp but accepts NULL.
  */