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

[Maximilian Bloch]

On 07.05.2016 18:00, Bastien ROUCARIES wrote:
> What is your arch ?

$ uname -a
Linux ***** 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2 (2016-04-08)
x86_64 GNU/Linux



On 07.05.2016 18:00, Bastien ROUCARIES wrote:
> 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)
>>