[cristianchiriac]

Problem

A correlation condition with an infinite count raises a raw OverflowError instead of a SigmaError:

correlation:
    type: event_count
    rules: base_rule
    group-by: [N]
    timespan: 5m
    condition:
        gte: .inf

OverflowError: cannot convert float infinity to integer

.inf is a valid YAML float, so this is reachable from rule files. Tooling that catches SigmaError to report bad rules crashes instead.

Root cause

SigmaCorrelationCondition.from_dict() converts the count with int() but only catches ValueError. int(float("inf")) raises OverflowError. NaN already raises ValueError and is reported correctly.

Fix

Also catch OverflowError, so the existing SigmaCorrelationConditionError ("... is no valid Sigma correlation condition count") is raised. This is the same approach as #526 for SigmaNumber.

Tests

• test_correlation_condition_non_finite_count for inf and -inf. Both fail with OverflowError without the fix.
• Full test suite (excluding online tests), black --check and mypy pass locally.