[Pkg-gmagick-im-team] Bug#814836: imagemagick: Font Metrics faulty textWidth | Integer overflow

[Bastien ROUCARIES]

On Mon, Feb 15, 2016 at 8:48 PM, Maximilian Bloch
<maximilian.bloch at gmail.com> wrote:
> Package: imagemagick
> Severity: normal

What is your arch ?
>
> Dear Maintainer,
>
> I seem to have stumbled across an integer overflow issue with imagemagick, pertaining to calculated font metrics (width/bounds) for many fonts depending on pointsize. A more detailed bug report of mine can be found in the ImageMagick Forum:
>
>   https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=29135
>
>
> * What led up to the situation?
>
> $ convert -debug annotate -pointsize 72 -font ./RNS.ttf label:g null:
>
> NOTE RNS.ttf was taken from http://www.1001fonts.com/rns-font.html
>
>
> * What was the outcome of this action?
>
> 2016-02-15T20:29:34+01:00 0:00.010 0.000u 6.9.3 Annotate convert[3989]: annotate.c/RenderFreetype/1421/Annotate
>   Font ./RNS.ttf; font-encoding none; text-encoding none; pointsize 72
> 2016-02-15T20:29:34+01:00 0:00.010 0.000u 6.9.3 Annotate convert[3989]: annotate.c/GetTypeMetrics/843/Annotate
>   Metrics: text: g; width: 3.35545e+07; height: 103; ascent: 70; descent: -31; max advance: 61; bounds: -3.35544e+07,-0.09375  35,55.1719; origin: 36,0; pixels per em: 72,72; underline position: -1.5625; underline thickness: 0.78125
>
>
> * What outcome did you expect instead?
>
> 2016-02-12T06:56:07-05:00 0:00.110 0.010u 7.0.0 Annotate convert[22115]: annotate.c/RenderFreetype/1442/Annotate
>   Font ./RNS.ttf; font-encoding none; text-encoding none; pointsize 72
> 2016-02-12T06:56:07-05:00 0:00.110 0.010u 7.0.0 Annotate convert[22115]: annotate.c/GetTypeMetrics/860/Annotate
>   Metrics: text: g; width: 38.5625; height: 103; ascent: 70; descent: -31; max advance: 61; bounds: 0.4375,-0.09375  35,55.1719; origin: 36.2812,0; pixels per em: 72,72; underline position: -1.5625; underline thickness: 0.78125
>
> Any help would be much appreciated.
>
> Thanks,
> Max
>
> -- System Information:
> Debian Release: 8.3
>   APT prefers stable-updates
>   APT policy: (500, 'stable-updates'), (500, 'stable')
> Architecture: amd64 (x86_64)
>
> Kernel: Linux 3.16.0-4-amd64 (SMP w/1 CPU core)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
>