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Unsigned integer overflow is well-defined and not undefined behavior.
It is commonly used for hashing or pseudo random number generation.
But it is still useful to enable undefined behavior sanitizer checks on
unsigned arithmetic to detect possible issues on counters or variables
with similar purpose or missed overflow checks on user input.
Use a spaceship operator like comparison instead of subtraction.
policydb.c:851:24: runtime error: unsigned integer overflow: 801 - 929 cannot be represented in type 'unsigned int'
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