Summary

Unsafely modifying the free memory pointer

Vulnerability Details

The code modifies the free memory pointer directly mstore(0x40, 0xbac65e5b). This is a low-level operation that can potentially interfere with Solidity's memory management, leading to unexpected behavior.

Impact

High.

Tools Used

Manual review.

Recommendations

If you are modifying the free-memory pointer, then consider setting it back to the original value of 0x80 at the end of the assembly code.