Previously, the pdftoopvp filter used gmalloc for memory allocations. This could result in integer overflow flaws, leading to heap-based buffer overflows. If a malicious PDF file were processed, it could lead to arbitrary code execution with the privileges of the "lp" user. The following patch introduces the use of gmallocn and gmallocn3, which attempt to check for integer overflows:

http://cgit.freedesktop.org/poppler/poppler/commit/?id=7b2d314a61fd0e12f47c62996cb49ec0d1ba747a

Acknowledgements:

This issue was discovered by Florian Weimer of the Red Hat Product Security Team.