tree 6e697796c44d390b6db2d50f8acb1b7fdaea6cc2
parent 1653953c3954b6ec85dad042dd82358e35656c0b
author Michael Bradshaw <mjbshaw@google.com> 1516412073 -0800
committer Michael Bradshaw <mjbshaw@google.com> 1516657814 -0800

Set a maximum limit on element recursion depth

The maximum recursion depth is set to 25. If that's not sufficient for
someone's needs, they're welcome to submit a patch that makes it
configurable.

This fixes a stack overflow found by AutoFuzz. The stack overflow was
caused by recursing too much. I've included the fuzzer's test cases in
the fuzzing/corpus directory. I've also created two (one for SimpleTag
and ChapterAtom each) additional test files, each comprised of 10,000
recursively nested elements. Manually running the fuzzer (with ASan and
UBSan) shows all inputs are now handled correctly, and no stack
overflows occur.

Change-Id: I8514259fd0788e71a58e3ccce2a0fb8a3523acfc