Pages array isn't expanded when starting a new sheet.

[TangcuLiyuu]

Hello, I found a buffer overflow in parse_pre function,ps-pdf.cxx:5681

Reporter:
TangcuLiyuu from Central China Normal University

test platform:
htmldoc Version ：current
OS :Kali 6.6.9-1kali1 (2024-01-08)
kernel: 6.6.9-amd64

reproduced:

(htmldoc with asan build option)
./htmldoc -f test.pdf ./test.html
poc.zip

[michaelrsweet]

Cannot reproduce on macOS. Trying Linux.

[michaelrsweet]

OK, figured out this happens for book mode but not web page mode.

[michaelrsweet]

That said, it isn't a buffer overflow specifically, but the "pages" array hasn't been expanded yet when it checks for where a page break is needed.

[michaelrsweet]

[master 2a861d7] Check pages array before finding the first N-up page (Issue #539)