[Bug 1793485] Re: segfault in png to gif conversion

[Dariusz Gadomski]

** Attachment added: "SH_HL_08_Step1_F029.png"
   https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/1793485/+attachment/5190922/+files/SH_HL_08_Step1_F029.png

** Description changed:

  Regression between 8:6.8.9.9-7ubuntu5.9 and 8:6.8.9.9-7ubuntu5.12.
  
  Test case:
  1. Download the attached pngs.
  2. Run:
  /usr/bin/convert -limit memory 512MiB -limit map 0MiB -limit file 10 -delay 16 -loop 0 -coalesce -deconstruct ./*.png ./output.gif
  
  Expected result:
  Process finishes with resulting output.gif.
  
  Actual result:
  Process is aborted with SIGSEGV:
  
  Other information:
  In my tests looks like it has been introduced in 8:6.8.9.9-7ubuntu5.11 and does not occur on Bionic.
+ 
+ Stack trace:
+ #0  EncodeImage (image_info=0x645c40, data_size=<optimized out>, 
+     image=0x636890) at ../../coders/gif.c:676
+ #1  WriteGIFImage (image_info=0x640700, image=0x636890)
+     at ../../coders/gif.c:1905
+ #2  0x00007ffff79a5f0f in WriteImage (image_info=image_info at entry=0x618680, 
+     image=image at entry=0x62cb30) at ../../magick/constitute.c:1184
+ #3  0x00007ffff79a684f in WriteImages (image_info=image_info at entry=0x60fcd0, 
+     images=<optimized out>, images at entry=0x62cb30, filename=<optimized out>, 
+     exception=exception at entry=0x602ea0) at ../../magick/constitute.c:1335
+ #4  0x00007ffff763e84e in ConvertImageCommand (image_info=0x60fcd0, argc=19, 
+     argv=0x6143b0, metadata=0x0, exception=0x602ea0)
+     at ../../wand/convert.c:3215
+ #5  0x00007ffff76ab527 in MagickCommandGenesis (
+     image_info=image_info at entry=0x60aab0, 
+     command=0x4007f0 <ConvertImageCommand at plt>, argc=argc at entry=19, 
+     argv=argv at entry=0x7fffffffdc68, metadata=metadata at entry=0x0, 
+     exception=exception at entry=0x602ea0) at ../../wand/mogrify.c:168
+ #6  0x0000000000400877 in ConvertMain (argv=0x7fffffffdc68, argc=19)
+     at ../../utilities/convert.c:81
+ #7  main (argc=19, argv=0x7fffffffdc68) at ../../utilities/convert.c:92

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https://bugs.launchpad.net/bugs/1793485

Title:
  segfault in png to gif conversion

Status in imagemagick package in Ubuntu:
  New

Bug description:
  Regression between 8:6.8.9.9-7ubuntu5.9 and 8:6.8.9.9-7ubuntu5.12.

  Test case:
  1. Download the attached pngs.
  2. Run:
  /usr/bin/convert -limit memory 512MiB -limit map 0MiB -limit file 10 -delay 16 -loop 0 -coalesce -deconstruct ./*.png ./output.gif

  Expected result:
  Process finishes with resulting output.gif.

  Actual result:
  Process is aborted with SIGSEGV:

  Other information:
  In my tests looks like it has been introduced in 8:6.8.9.9-7ubuntu5.11 and does not occur on Bionic.

  Stack trace:
  #0  EncodeImage (image_info=0x645c40, data_size=<optimized out>, 
      image=0x636890) at ../../coders/gif.c:676
  #1  WriteGIFImage (image_info=0x640700, image=0x636890)
      at ../../coders/gif.c:1905
  #2  0x00007ffff79a5f0f in WriteImage (image_info=image_info at entry=0x618680, 
      image=image at entry=0x62cb30) at ../../magick/constitute.c:1184
  #3  0x00007ffff79a684f in WriteImages (image_info=image_info at entry=0x60fcd0, 
      images=<optimized out>, images at entry=0x62cb30, filename=<optimized out>, 
      exception=exception at entry=0x602ea0) at ../../magick/constitute.c:1335
  #4  0x00007ffff763e84e in ConvertImageCommand (image_info=0x60fcd0, argc=19, 
      argv=0x6143b0, metadata=0x0, exception=0x602ea0)
      at ../../wand/convert.c:3215
  #5  0x00007ffff76ab527 in MagickCommandGenesis (
      image_info=image_info at entry=0x60aab0, 
      command=0x4007f0 <ConvertImageCommand at plt>, argc=argc at entry=19, 
      argv=argv at entry=0x7fffffffdc68, metadata=metadata at entry=0x0, 
      exception=exception at entry=0x602ea0) at ../../wand/mogrify.c:168
  #6  0x0000000000400877 in ConvertMain (argv=0x7fffffffdc68, argc=19)
      at ../../utilities/convert.c:81
  #7  main (argc=19, argv=0x7fffffffdc68) at ../../utilities/convert.c:92

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