InlineKlass::initialize_calling_convention has a path which frees the array after having called `set_extended_sig` without clearing the pointer. This can cause a double free.
Looked at other uses of this, and it seems like all other uses of `extended_sig` are explicitly or implicitly guarded from reading it incorrectly. `InlineKlass::deallocate_contents` will however cause problems. By clearing it once it is freed we both remove the use after free and double free, and will have a nullptr crash incase there is an incorrect use that pops up later. --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Fix dangling extended_sig pointer Changes: https://git.openjdk.org/valhalla/pull/2408/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2408&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8384079 Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod Patch: https://git.openjdk.org/valhalla/pull/2408.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2408/head:pull/2408 PR: https://git.openjdk.org/valhalla/pull/2408
