compiler-rt/test/fuzzer/NullDerefTest.cpp

   1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   2 // See https://llvm.org/LICENSE.txt for license information.
   3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   4
   5 // Simple test for a fuzzer. The fuzzer must find the string "Hi!".
   6 #include <cstddef>
   7 #include <cstdint>
   8 #include <cstdlib>
   9 #include <cstdio>
  10
  11 static volatile int Sink;
  12 static volatile int *Null = 0;
  13
  14 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  15   if (Size > 0 && Data[0] == 'H') {
  16     Sink = 1;
  17     if (Size > 1 && Data[1] == 'i') {
  18       Sink = 2;
  19       if (Size > 2 && Data[2] == '!') {
  20         printf("Found the target, dereferencing NULL\n");
  21         *Null = 1;
  22       }
  23     }
  24   }
  25   return 0;
  26 }
  27