Abusing the return pointer is an anti-disassembling technique that involves using the return instruction (RETN) in a way that is not expected by the disassembler. This can make it more difficult for the disassembler to accurately reconstruct the program's original instructions and can also make it more difficult for analysts to understand the program's behavior.

The RETN instruction is normally used to return from a function call, by returning control to the calling function. It typically takes a single operand, which is the number of bytes that the caller should add to the stack pointer after the return has been executed. This allows the caller to clean up the stack and restore the registers to their original values before the call was made.

However, if the RETN instruction is used for another purpose, the disassembler may not be able to accurately interpret it and may generate incorrect disassembly output. For example, the RETN instruction could be used as a jump target for other instructions, such as a CALL or JMP instruction. This would cause the disassembler to prematurely terminate the function, because it would assume that the RETN instruction marks the end of the function.