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Subject: Re: ImageMagick maybe broken by libgs9 upgrade
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From: Marco Atzeri via Cygwin <cygwin AT cygwin DOT com>
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On 23.06.2020 23:02, Marco Atzeri wrote:
> On 23.06.2020 22:56, Ken Brown via Cygwin wrote:
>>
>> I think I've found the problem, although it will take patching and 
>> rebuilding ImageMagick (which I haven't done) to confirm that I'm right.
>>
>> In the ImageMagick source file coders/ps.c:237, there's a call to 
>> ghost_info->new_instance, a.k.a. gsapi_new_instance (see line 214).  
>> The documentation of the latter in the ghostscript sources 
>> (psi/iapi.c:57) says that the first argument pinstance should satisfy 
>> *pinstance == NULL in the first call to that function.
>>
>> But *pinstance in this call is the variable 'interpreter', defined 
>> without initialization in ps.c:191.  As a result, **pinstance contains 
>> garbage, and the program eventually crashes when it tries to 
>> dereference a garbage pointer.
>>
>> The fix, if I'm right, is to initialize interpreter to NULL in ps.c:191.
>>
>> Ken
> 
> Noted.
> 
> Regards
> MArco
> 

a test ImageMagick-6.9.10.11-3 is going up.
Let me know if it solves the problem

Regards
Marco
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