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Define minimum buffer size (#7440)

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* add check for zero sized buffers

* Define minimum flatbuffer size
This commit is contained in:
Derek Bailey
2022-08-14 12:40:57 -07:00
committed by GitHub
parent 3cc2daa78f
commit 44a7dc9995
3 changed files with 40 additions and 0 deletions
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11
include/flatbuffers/verifier.h
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@@ -178,6 +178,12 @@ class Verifier FLATBUFFERS_FINAL_CLASS {
template<typename T>
bool VerifyBufferFromStart(const char *const identifier, const size_t start) {
// Buffers have to be of some size to be valid. The reason it is a runtime
// check instead of static_assert, is that nested flatbuffers go through
// this call and their size is determined at runtime.
if (!Check(size_ >= FLATBUFFERS_MIN_BUFFER_SIZE)) return false;
// If an identifier is provided, check that we have a buffer
if (identifier && !Check((size_ >= 2 * sizeof(flatbuffers::uoffset_t) &&
BufferHasIdentifier(buf_ + start, identifier)))) {
return false;
@@ -198,7 +204,12 @@ class Verifier FLATBUFFERS_FINAL_CLASS {
template<typename T>
bool VerifyNestedFlatBuffer(const Vector<uint8_t> *const buf,
const char *const identifier) {
// An empty buffer is OK as it indicates not present.
if (!buf) return true;
// If there is a nested buffer, it must be greater than the min size.
if(!Check(buf->size() >= FLATBUFFERS_MIN_BUFFER_SIZE)) return false;
Verifier nested_verifier(buf->data(), buf->size());
return nested_verifier.VerifyBuffer<T>(identifier);
}