Add setjmp() to progressive png fuzzer

testing/libfuzzer/fuzzers/libpng_read_fuzzer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 49 matching lines @@
 
   png_set_crc_action(png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
 
   png_infop info_ptr = png_create_info_struct(png_ptr);
   assert(info_ptr);
 
   base::ScopedClosureRunner struct_deleter(base::Bind(
         &png_destroy_read_struct, &png_ptr, &info_ptr, nullptr));
 
 #ifdef PNG_FUZZ_PROGRESSIVE
+  if (setjmp(png_jmpbuf(png_ptr))) {
+    return 0;
+  }
+
   png_set_progressive_read_fn(png_ptr, nullptr, nullptr, nullptr, nullptr);
   png_process_data(png_ptr, info_ptr, const_cast<uint8_t*>(data), size);
 #else
   // Setting up reading from buffer.
   std::unique_ptr<BufState> buf_state(new BufState());
   buf_state->data = data + kPngHeaderSize;
   buf_state->bytes_left = size - kPngHeaderSize;
   png_set_read_fn(png_ptr, buf_state.get(), user_read_data);
   png_set_sig_bytes(png_ptr, kPngHeaderSize);
 
@@ skipping 32 matching lines @@
 
   for (int pass = 0; pass < passes; ++pass) {
     for (png_uint_32 y = 0; y < height; ++y) {
       png_read_row(png_ptr, static_cast<png_bytep>(row), NULL);
     }
   }
 #endif  // PNG_FUZZ_PROGRESSIVE
 
   return 0;
 }