[FFmpeg-trac] #4148(avcodec:open): Crash in ff_add_bytes_l2_sse2 when decoding attached APNG file

[FFmpeg]

#4148: Crash in ff_add_bytes_l2_sse2 when decoding attached APNG file
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             Reporter:  benoit       |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  png crash    |               Blocked By:
  SIGSEGV regression                 |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by kurosu):

 Note: that code should not present for mmx.
 15 should be replaced by mmsize-1 (although the probability of an AVX2
 version is low).

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Ticket URL: <https://trac.ffmpeg.org/ticket/4148#comment:7>
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