Files
pdfcraft/crates/render
6ed0e66848 render: don't let a hostile page-tree /Count abort inspection (#956)
* render: don't let a hostile page-tree /Count abort inspection

Found by cargo xtask fuzz on Windows (seed 42): a 355-byte PDF whose
/Type /Pages node carries /Count 4294967295 aborted pdfcraft-cli
check-one with a 48 GiB allocation (4294967295 x 12 bytes) - an abort,
which the engine's catch_unwind guard cannot catch. AGENTS.md §4
requires a malformed PDF to produce an actable error, never a crash.

The lopdf Structure impl delegated get_pages to lopdf's own page-tree
walk, which trusts /Count and pre-allocates by it. The trait's default
walk (depth cap, seen-set, checked page numbering) handles the same
input fine, so the override is simply dropped and the bounded walk
counts the real pages.

Comes with a synthetic regression test (/Count 4294967295, one real
page); cargo test -p pdfcraft-render, clippy -D warnings, fmt --check
and an end-to-end check-one run all pass.

* Drop the duplicated use super::* in the structure tests

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Co-authored-by: pechnikov2026-star <[email protected]>
Co-authored-by: Brandon Thomas <[email protected]>
2026-10-11 13:33:02 -04:00
..