[libfuzzer] libpng_read_fuzzer: call png_set_user_limits() for MSan.

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 28 matching lines @@
   std::vector<unsigned char> v(data, data + size);
   if (png_sig_cmp(v.data(), 0, kPngHeaderSize)) {
     // not a PNG.
     return 0;
   }
 
   png_structp png_ptr = png_create_read_struct
     (PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
   assert(png_ptr);
 
+#ifdef MEMORY_SANITIZER
+  // To avoid OOM with MSan (crbug.com/648073). These values are recommended as
+  // safe settings by https://github.com/glennrp/libpng/blob/libpng16/pngusr.dfa
+  png_set_user_limits(png_ptr, 65535, 65535);
+#endif
+
   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));
 
   // Setting up reading from buffer.
   std::unique_ptr<BufState> buf_state(new BufState());
@@ skipping 36 matching lines @@
   png_start_read_image(png_ptr);
 
   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);
     }
   }
 
   return 0;
 }