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Verifier for FlexBuffers (#6977)

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* Verifier for FlexBuffers

* Verifier improvements & fuzzer
This commit is contained in:
Wouter van Oortmerssen
2021-12-10 14:59:08 -08:00
committed by GitHub
parent 705f27f6ee
commit e367ca32ad
11 changed files with 300 additions and 6 deletions
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6
src/idl_gen_text.cpp
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@@ -265,6 +265,12 @@ struct JsonPrinter {
val = reinterpret_cast<const Struct *>(table)->GetStruct<const void *>(
fd.value.offset);
} else if (fd.flexbuffer && opts.json_nested_flexbuffers) {
// We could verify this FlexBuffer before access, but since this sits
// inside a FlatBuffer that we don't know wether it has been verified or
// not, there is little point making this part safer than the parent..
// The caller should really be verifying the whole.
// If the whole buffer is corrupt, we likely crash before we even get
// here.
auto vec = table->GetPointer<const Vector<uint8_t> *>(fd.value.offset);
auto root = flexbuffers::GetRoot(vec->data(), vec->size());
root.ToString(true, opts.strict_json, text);