[FFmpeg-trac] #3120(avcodec:open): Crash when converting internal SSA to SRT

[FFmpeg]

#3120: Crash when converting internal SSA to SRT
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             Reporter:  eelco       |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  important   |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  ass crash   |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
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Changes (by Cigaes):

 * analyzed:  0 => 1


Comment:

 The problem is that {{{srt_print}}} uses a fixed-size buffer and does not
 check for overflow with the {{{vsnprintf}}} return value.

 The easy solution is to add that kind of check and reject overly long
 lines. The good solution is to use a dynamic buffer, possibly AVBPrint.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3120#comment:6>
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