tree dd09b8de6a6bc3fa4f760ea00fbf62a79e557bb5
parent 9fdbe7d2ed60e4702f94ade0c50b4e950ea5519d
author Mitch Phillips <31459023+hctim@users.noreply.github.com> 1585085827 -0700
committer Copybara-Service <copybara-worker@google.com> 1601491379 -0700

[GWP-ASan] Only pack frames that are stored.

Summary:
Backtrace() returns the number of frames that are *available*, rather
than the number of frames stored. When we pack, we supply the number of
frames we have stored. The number of available frames can exceed the
number of stored frames, leading to stack OOB read.

Fix up this problem.

Reviewers: eugenis

Reviewed By: eugenis

Subscribers: #sanitizers, morehouse, cferris, pcc

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D76722

GitOrigin-RevId: a4e8d89704d2584d5c56cb27745beab25c7b9b36