Debugging von Segmentation fault in XPDF

[Florian Lohoff]

On Wed, Feb 09, 2005 at 02:04:31PM +0100, Bernd Fehling wrote:
> "Geheim"???
> Nö, frei verfügbar:
> http://epub.ub.uni-muenchen.de/archive/00000003/01/schlicht_isolation.pdf
> 
> User Passwort: No
> Master Passwort: Yes
> Printing: Fully Allowed
> Changing: Not Allowed
> Copying: Not Allowed
> Encryption: 40-bit RC4
> 
> xpdf selbst zeigt die Datei klaglos an.
> Ja, ich weiss, "Copying: Not Allowed" dann geht "pdftotext" nicht.
> --> Wurde schon korrigiert.

Valgrind wirft dieses:

==10536== Invalid read of size 4
==10536==    at 0x8075B7E: JArithmeticDecoder::readByte() (JArithmeticDecoder.cc:107)
==10536==    by 0x8075627: JArithmeticDecoder::~JArithmeticDecoder() (JArithmeticDecoder.cc:96)
==10536==    by 0x80783F7: JBIG2Stream::~JBIG2Stream() (JBIG2Stream.cc:1144)
==10536==    by 0x808B90C: Object::free() (Object.cc:129)
==10536==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==10536==
==10536== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==10536==  Access not within mapped region at address 0x0
==10536==    at 0x8075B7E: JArithmeticDecoder::readByte() (JArithmeticDecoder.cc:107)
==10536==    by 0x8075627: JArithmeticDecoder::~JArithmeticDecoder() (JArithmeticDecoder.cc:96)
==10536==    by 0x80783F7: JBIG2Stream::~JBIG2Stream() (JBIG2Stream.cc:1144)
==10536==    by 0x808B90C: Object::free() (Object.cc:129)

   1123 JBIG2Stream::~JBIG2Stream() {
[...]
   1141   delete huffDecoder;
   1142   delete mmrDecoder;
   1143   if (pageBitmap) {
   1144     delete pageBitmap;
   1145   }
   1146   if (segments) {
   1147     deleteGList(segments, JBIG2Segment);
   1148   }


object.cc
    109 void Object::free() {
[...]
    126     break;
    127   case objStream:
    128     if (!stream->decRef()) {
    129       delete stream;
    130     }
    131     break;

Flo
-- 
Florian Lohoff                  flo at rfc822.org             +49-171-2280134
                        Heisenberg may have been here.
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