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.c

@@ -23,6 +23,22 @@ void* FUZZ_malloc(size_t size)
     return NULL;
 }
 
+void* FUZZ_malloc_rand(size_t size, FUZZ_dataProducer_t *producer)
+{
+    if (size > 0) {
+        void* const mem = malloc(size);
+        FUZZ_ASSERT(mem);
+        return mem;
+    } else {
+        uintptr_t ptr = 0;
+        /* Add +- 1M 50% of the time */
+        if (FUZZ_dataProducer_uint32Range(producer, 0, 1))
+            FUZZ_dataProducer_int32Range(producer, -1000000, 1000000);
+        return (void*)ptr;
+    }
+
+}
+
 int FUZZ_memcmp(void const* lhs, void const* rhs, size_t size)
 {
     if (size == 0) {