[FFmpeg-trac] #9917(undetermined:new): Crash on (corrupt) DNG file

FFmpeg trac at avcodec.org
Wed Sep 14 00:28:37 EEST 2022

#9917: Crash on (corrupt) DNG file
             Reporter:  John P.      |                    Owner:  (none)
  Kiffmeyer                          |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
Comment (by John P. Kiffmeyer):

 Replying to [comment:3 Carl Eugen Hoyos]:
 > Did you try to cut the input file or overwrite parts of it?
 > Note that I am not aware of many tickets not using copyrighted samples.

 Ah, hadn't considered that!  At your suggestion, I fiddled around a little
 bit and found a byte range I could overwrite but still get the crash.  The
 file is 3785330 bytes long, and overwriting [243, 3776306) with null bytes
 leaves the metadata largely intact and the crash still happens (the
 backtrace looks the same to me).

 Since the file is a little larger than the ticket attachment limit of
 2.5MB, I gzipped it and attached that.  A simple 'gunzip' will inflate it
 back to the dng file that reproduces the crash.
Ticket URL: <https://trac.ffmpeg.org/ticket/9917#comment:6>
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