In the case that `op >= oend_w` it is possible that `diff < 8` because the two buffers could be adjacent. Credit to OSS-Fuzz, which found the bug. It isn't reproducible because it depends on the memory layout.
In the case that `op >= oend_w` it is possible that `diff < 8` because the two buffers could be adjacent. Credit to OSS-Fuzz, which found the bug. It isn't reproducible because it depends on the memory layout.