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Cap num_externs to 4096 #18909

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Cap num_externs to 4096 #18909

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10 changes: 9 additions & 1 deletion backends/xnnpack/runtime/XNNCompiler.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1916,9 +1916,17 @@ ET_NODISCARD Error XNNCompiler::compileModel(
xnn_status_to_string(status));

// create xnnpack subgraph
uint32_t num_externs = flatbuffer_graph->num_externs();
ET_CHECK_OR_RETURN_ERROR(
num_externs <= 4096,
InvalidProgram,
"XNNPACK flatbuffer blob has num_externs (%u) which exceeds maximum (4096)."
" This likely indicates a corrupted or invalid serialized graph",
Comment on lines +1920 to +1924
num_externs);
Comment on lines +1923 to +1925

xnn_subgraph_t subgraph_ptr = nullptr;
status = xnn_create_subgraph(
/*external_value_ids=*/flatbuffer_graph->num_externs(),
/*external_value_ids=*/num_externs,
/*flags=*/0,
&subgraph_ptr);
ET_CHECK_OR_RETURN_ERROR(
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