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load validation #702

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10 changes: 10 additions & 0 deletions src/pq_flash_index.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -190,6 +190,16 @@ std::vector<bool> PQFlashIndex<T, LabelT>::read_nodes(const std::vector<uint32_t
{
uint32_t *node_nhood = offset_to_node_nhood(node_buf);
auto num_nbrs = *node_nhood;
// Validate num_nbrs is within expected bounds
if (num_nbrs > _max_degree)
{
std::stringstream stream;
stream << "Corrupt or mismatched index data detected: num_nbrs (" << num_nbrs
<< ") exceeds max_degree (" << _max_degree << "). "
<< "This may indicate a data type mismatch - ensure the data_type parameter "
<< "matches the type used when building the index.";
throw diskann::ANNException(stream.str(), -1, __FUNCSIG__, __FILE__, __LINE__);
}
nbr_buffers[i].first = num_nbrs;
memcpy(nbr_buffers[i].second, node_nhood + 1, num_nbrs * sizeof(uint32_t));
}
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