podofo: NULL pointer dereference in PdfOutputStream.cpp

[Agostino Sarubbo <ago () gentoo org>]

Description:
podofo is a C++ library to work with the PDF file format.

A fuzz on it with the UBSAN discovered a NULL pointer access. The upstream 
project denies me to open a new ticket. So, I’m unable to communicate with 
them.

The complete UBSan output:

# podofopdfinfo $FILE
/tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/src/base/PdfOutputStream.cpp:116:33: 
runtime error: null pointer passed as argument 2, which is declared to never 
be null

Affected version:
0.9.4

Fixed version:
N/A

Commit fix:
N/A

Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.

CVE:
N/A

Reproducer:
https://github.com/asarubbo/poc/blob/master/00143-podofo-nullptr-PdfOutputStream

Timeline:
2017-01-05: bug discovered
2017-02-01: blog post about the issue

Note:
This bug was found with American Fuzzy Lop.

Permalink:
https://blogs.gentoo.org/ago/2017/02/01/podofo-null-pointer-dereference-in-pdfoutputstream-cpp

-- 
Agostino Sarubbo
Gentoo Linux Developer