65 lines
2.7 KiB
Markdown
65 lines
2.7 KiB
Markdown
# UNDF: UNDF-2026-000000595
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# onos-0004: ConnectivityIntentCompiler resourcesAllocated List.contains O(R×C) → O(C) with Set
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## Classification
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| Field | Value |
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|-------------|-------|
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| CWE | CWE-407 Inefficient Algorithmic Complexity |
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| Severity | MEDIUM |
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| Component | `core/net/src/main/java/org/onosproject/net/intent/impl/compiler/ConnectivityIntentCompiler.java:263,274,288` |
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| Function | `ConnectivityIntentCompiler.allocateBandwidth()` |
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| Hot path | Intent compilation — called per bandwidth allocation request |
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| Status | PATCHED (unit test PASS) |
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## Defect
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`allocateBandwidth()` builds two `List` collections and then uses `.contains()` inside
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`.stream().filter()` — O(R) per element — to deduplicate resources:
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```java
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// ConnectivityIntentCompiler.java:253
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List<Resource> resourcesAllocated =
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resourcesFromAllocations(resourceAllocations); // List<Resource>
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List<ResourceId> idsResourcesAllocated = resourceIds(resourcesAllocated); // List<ResourceId>
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// O(R) per element — iterates all resourcesAllocated for each incoming resource
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List<Resource> incomingResources =
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resources(connectPoints, bw).stream()
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.filter(r -> !resourcesAllocated.contains(r)) // O(R)
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.collect(Collectors.toList());
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// O(R) per element again
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List<Resource> resourcesToAdd =
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incomingResources.stream()
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.filter(r -> !idsResourcesAllocated.contains(r.id())) // O(R)
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.collect(Collectors.toList());
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// O(R) per element a third time
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.filter(rA -> resourceIds(resourcesToUpdate).contains(rA.resource().id())) // O(R)
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```
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With R=100 already-allocated resources and C=50 incoming connect-point resource candidates:
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**100 × 50 × 3 = 15,000 comparisons per `allocateBandwidth()` call**, repeated for each
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intent recompile and every topology change that triggers reallocation.
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## Fix
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Convert `resourcesAllocated` and `idsResourcesAllocated` to `Set` before the streams:
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```java
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Set<Resource> resourcesAllocatedSet = new HashSet<>(resourcesAllocated);
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Set<ResourceId> idsResourcesAllocatedSet = new HashSet<>(idsResourcesAllocated);
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List<Resource> incomingResources =
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resources(connectPoints, bw).stream()
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.filter(r -> !resourcesAllocatedSet.contains(r)) // O(1)
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.collect(Collectors.toList());
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List<Resource> resourcesToAdd =
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incomingResources.stream()
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.filter(r -> !idsResourcesAllocatedSet.contains(r.id())) // O(1)
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.collect(Collectors.toList());
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```
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Speedup: ~50× at R=100, C=50 (15,000 → 300 effective ops).
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