[Bug 1800003] Re: evince crashes in FcConfigParseAndLoad

[J B]

This bug https://gitlab.freedesktop.org/fontconfig/fontconfig/issues/71
suggests that substantial improvements have been made to the fontconfig
package against null pointer dereferences after version 2.13.0-5.

https://cgit.freedesktop.org/fontconfig/commit/?id=efac784b0108d3140d7ec51cf22cb8a4453bd566
https://cgit.freedesktop.org/fontconfig/commit/?id=b1762935c3db2bc611750c61ce9cb38b9008db6b
https://cgit.freedesktop.org/fontconfig/commit/?id=b047e299546ac3abb79cf0bac3c67f5c2dfc7fb6
https://cgit.freedesktop.org/fontconfig/commit/?id=f3981a8bcd97a0388bf150ea7c1b4a1015e5e358

Can fontconfig be updated?

** Bug watch added: gitlab.freedesktop.org/fontconfig/fontconfig/issues #71
   https://gitlab.freedesktop.org/fontconfig/fontconfig/issues/71

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https://bugs.launchpad.net/bugs/1800003

Title:
  evince crashes in FcConfigParseAndLoad

Status in fontconfig package in Ubuntu:
  Confirmed

Bug description:
  I have the following situation persistently on my system (Ubuntu
  18.04.1 on Dell Latitude E6500):

  Evince called with any pdf file crashes immediately with a
  segmentation fault. From the crash dump, I see that the crash happens
  in fontconfig's FcConfigParseAndLoad function, i.e. when the system
  fonts.conf is read. I can reproduce the crash with the following
  minimal example:

  ----
  #include </usr/include/fontconfig/fontconfig.h>

  const FcChar8* filename = "/home/mirkoh/fontconfig-test/fonts.conf";
  FcConfig* config;

  int main(){
     FcConfigParseAndLoad(config, filename, FcTrue);
  }
  ----

  The fonts.conf file used here is also absolutely minimal:

  ----
  <?xml version="1.0"?>
  <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
  <fontconfig>
  </fontconfig>
  ----

  (Get me right. It first happened with my system fonts.conf, which is
  not empty. In order to find out whether a specific entry lead to the
  crash, I deleted entry after entry, ultimately reaching the file
  above, and always FcConfigParseAndLoad crashes.

  I have no idea how to go on from here.

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