Assembler crash via unchecked zero divisor

Divide by zero in crasm 1.8-3 allows attackers to crash the command-line assembler by supplying a crafted source file. The opdiv function in src/operator.c divides presult->value by parg->value without checking whether the divisor is zero. Exploitation requires the crafted file to be passed to crasm; the resulting arithmetic exception terminates that assembler process without reported data disclosure or modification.