libcupsfilters-tests: cups-filters contains backends, filters, and other software required to getthe cups printing service working on opera...

cups-filters contains backends, filters, and other software required to getthe cups printing service working on operating systems other than macos. Incups-filters prior to 1.28.18, by crafting a PDF file with a large`MediaBox` value, an attacker can cause CUPS-Filter 1.x’s `pdftoraster`tool to write beyond the bounds of an array. First, a PDF with a large`MediaBox` width value causes `header.cupsWidth` to become large. Next,the calculation of `bytesPerLine = (header.cupsBitsPerPixel *header.cupsWidth + 7) / 8` overflows, resulting in a small value. Then,`lineBuf` is allocated with the small `bytesPerLine` size. Finally,`convertLineChunked` calls `writePixel8`, which attempts to write to`lineBuf` outside of its buffer size (out of bounds write). Inlibcupsfilters, the maintainers found the same `bytesPerLine`multiplication without overflow check, but the provided test case does notcause an overflow there, because the values are different. Commit50d94ca0f2fa6177613c97c59791bde568631865 contains a patch, which isincorporated into cups-filters version 1.28.18.

Where it's fixed