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[C++] Fix vtable deduplication for 64-bit buffers >2GB (#8591)

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Fixes #8590
This commit is contained in:
Grzegorz Owsiany
2025-11-27 03:12:24 +01:00
committed by GitHub
parent 6e0dad8c5f
commit 8b02fe6178
1 changed files with 2 additions and 2 deletions
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4
include/flatbuffers/flatbuffer_builder.h
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@@ -469,8 +469,8 @@ class FlatBufferBuilderImpl {
if (dedup_vtables_) { if (dedup_vtables_) {
for (auto it = buf_.scratch_data(); it < buf_.scratch_end(); for (auto it = buf_.scratch_data(); it < buf_.scratch_end();
it += sizeof(uoffset_t)) { it += sizeof(uoffset_t)) {
auto vt_offset_ptr = reinterpret_cast<uoffset_t*>(it); auto vt_offset_ptr = reinterpret_cast<uoffset_t *>(it);
auto vt2 = reinterpret_cast<voffset_t*>(buf_.data_at(*vt_offset_ptr)); auto vt2 = reinterpret_cast<voffset_t *>(buf_.data_at(*vt_offset_ptr + length_of_64_bit_region_));
auto vt2_size = ReadScalar<voffset_t>(vt2); auto vt2_size = ReadScalar<voffset_t>(vt2);
if (vt1_size != vt2_size || 0 != memcmp(vt2, vt1, vt1_size)) continue; if (vt1_size != vt2_size || 0 != memcmp(vt2, vt1, vt1_size)) continue;
vt_use = *vt_offset_ptr; vt_use = *vt_offset_ptr;