FALSE NEGATIVE: Division-by-zero checking misses zero from a boolean product

[Rodri]

Hi, I found a false negative in Cppcheck 2.21.0 when a boolean comparison result is multiplied into the divisor.

Affected tool

Cppcheck 2.21.0

Affected checker

Cppcheck CheckOther::checkZeroDivision (zerodiv / zerodivcond)

Minimal reproducer

int divide_by_boolean_product(int x, int y) {
  int divisor = (x < 0) * y;
  return 1 / divisor;
}

Reproduction command

cppcheck --version
cppcheck --enable=warning --std=c11 --checkers-report=checkers.txt --template='{file}:{line}:{column}: [{id}] {message}' cppcheck-zerodiv-fn-boolean-product.c

Current behavior

Cppcheck produces neither a zerodiv nor a zerodivcond diagnostic. The checker report lists CheckOther::checkZeroDivision as active.

Expected behavior

Cppcheck should report a division-by-zero diagnostic at line 3 because x >= 0 makes (x < 0) and therefore divisor equal to zero.

[CHR]

Thanks for reporting, ticket is here: https://trac.cppcheck.net/ticket/15059