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[Courgette] Fix Fuzzer failure for ARM reloc parsing.
The Courgette Fuzzer found a bug where DisassemblerElf32ARM::ParseRelocationSection() overruns buffer because reloc units are not sorted. This CL fixes the bug by adding a check. The bug does not happen for X86 case, or for Zucchini. Bug: 961540 Change-Id: I5ff49c510e9fd8083f42a34e99140ff2c47201e4 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1818875 Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org> Commit-Queue: Samuel Huang <huangs@chromium.org> Cr-Commit-Position: refs/heads/master@{#698927}
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