tree 767fad657e620e4ac122c70c2678abf052442229
parent ec3a006e2b10743694463cf97bd3b1f802f53122
author Fabian Meumertzheim <meumertzheim@code-intelligence.com> 1620143537 -0700
committer Copybara-Service <copybara-worker@google.com> 1620612664 -0700

[libFuzzer] Preserve position hint in auto dictionary

Currently, the position hint of an entry in the persistent auto
dictionary is fixed to 1. As a consequence, with a 50% chance, the entry
is applied right after the first byte of the input. As the position 1
does not appear to have any particular significance, this is likely a
bug that may have been caused by confusing the constructor parameter
with a success count.

This commit resolves the issue by preserving any existing position hint
or disabling the hint if the original entry didn't have one.

Reviewed By: morehouse

Differential Revision: https://reviews.llvm.org/D101686

GitOrigin-RevId: b1048ff68298c1c4e303bbb77ca1832b2f873cd6