Check for corrupted ivalues. (pytorch#104243)

Hi! We've been fuzzing torchvision project with [sydr-fuzz](https://github.com/ispras/oss-sydr-fuzz).
We've found a SEGV error at address 0x0 at `vector.h:163` in pytorch third-party project flatbuffers.

The error occurs because the `ivalues` field of flatbuffer module can be null, so the corresponding check must be inserted.

torchvision version: 9d0a93eee90bf7c401b74ebf9c8be80346254f15

pytorch version: 0f1621d

OS: Ubuntu 20.04

How to reproduce

1. Build docker from [here](https://github.com/ispras/oss-sydr-fuzz/tree/master/projects/torchvision) and run the container:

        sudo docker build -t oss-sydr-fuzz-torchvision .
        sudo docker run --privileged --rm -v `pwd`:/fuzz -it oss-sydr-fuzz-torchvision /bin/bash

2. Run the target on this input:
[malformed-module.txt](https://github.com/pytorch/pytorch/files/11879653/malformed-module.txt)

        /encode_png_fuzz malformed-module.txt

3. You will see the following output:

        AddressSanitizer:DEADLYSIGNAL
        =================================================================
        ==1154==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000d17cc61 bp 0x7ffcbe8637f0 sp 0x7ffcbe863660 T0)
        ==1154==The signal is caused by a READ memory access.
        ==1154==Hint: address points to the zero page.
            #0 0xd17cc61 in flatbuffers::Vector<flatbuffers::Offset<torch::jit::mobile::serialization::IValue> >::size() const /pytorch/third_party/flatbuffers/include/flatbuffers/vector.h:163:48
            #1 0xd17cc61 in torch::jit::(anonymous namespace)::FlatbufferLoader::parseModule(torch::jit::mobile::serialization::Module*) /pytorch/torch/csrc/jit/mobile/flatbuffer_loader.cpp:293:32
            #2 0xd17dd23 in torch::jit::parse_and_initialize_mobile_module_for_jit(void*, unsigned long, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, std::vector<c10::IValue, std::allocator<c10::IValue> >&, c10::optional<c10::Device>, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >*) /pytorch/torch/csrc/jit/mobile/flatbuffer_loader.cpp:809:29
            #3 0xdd661b4 in torch::jit::parse_and_initialize_jit_module(std::shared_ptr<char>, unsigned long, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, c10::optional<c10::Device>) /pytorch/torch/csrc/jit/serialization/import.cpp:345:28
            #4 0xdd6b24a in torch::jit::_load_jit_module_from_bytes(std::shared_ptr<char>, unsigned long, std::shared_ptr<torch::jit::CompilationUnit>, c10::optional<c10::Device>, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, bool) /pytorch/torch/csrc/jit/serialization/import.cpp:547:14
            #5 0xdd6c6df in torch::jit::import_ir_module(std::shared_ptr<torch::jit::CompilationUnit>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, c10::optional<c10::Device>, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, bool, bool) /pytorch/torch/csrc/jit/serialization/import.cpp:443:10
            #6 0xdd6c1c7 in torch::jit::import_ir_module(std::shared_ptr<torch::jit::CompilationUnit>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, c10::optional<c10::Device>, bool) /pytorch/torch/csrc/jit/serialization/import.cpp:421:10
            #7 0xdd6dce4 in torch::jit::load(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, c10::optional<c10::Device>, bool) /pytorch/torch/csrc/jit/serialization/import.cpp:503:10
            #8 0xf2d3f75 in torch::serialize::InputArchive::load_from(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, c10::optional<c10::Device>) /pytorch/torch/csrc/api/src/serialize/input-archive.cpp:97:13
            #9 0x60509c in void torch::load<at::Tensor, char*&>(at::Tensor&, char*&) /pytorch/torch/include/torch/csrc/api/include/torch/serialize.h:107:11
            #10 0x6036be in LLVMFuzzerTestOneInput /vision/encode_png.cc:38:5
            #11 0x66b041 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /llvm-project-llvmorg-14.0.6/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
            #12 0x6544cc in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /llvm-project-llvmorg-14.0.6/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
            #13 0x65a61b in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /llvm-project-llvmorg-14.0.6/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9
            #14 0x654222 in main /llvm-project-llvmorg-14.0.6/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
            #15 0x7f0c87b9c082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
            #16 0x542cdd in _start (/encode_png_fuzz+0x542cdd)

        AddressSanitizer can not provide additional info.
        SUMMARY: AddressSanitizer: SEGV /pytorch/third_party/flatbuffers/include/flatbuffers/vector.h:163:48 in flatbuffers::Vector<flatbuffers::Offset<torch::jit::mobile::serialization::IValue> >::size() const
        ==1154==ABORTING

Pull Request resolved: pytorch#104243
Approved by: https://github.com/kit1980

torch/csrc/jit/mobile/flatbuffer_loader.cpp

@@ -290,6 +290,7 @@ mobile::Module FlatbufferLoader::parseModule(
   module_parsed_ = false;
 
   const auto* ivalues = module->ivalues();
+  TORCH_CHECK(ivalues != nullptr, "Corrupted ivalues field")
   all_ivalues_.resize(ivalues->size());
   all_types_.resize(module->object_types()->size());
   storages_.resize(module->storage_data_size());