[FFmpeg-trac] #9695(avformat:closed): Crash in libavformat/mov.c while playing a simple mp4 file

[FFmpeg]

#9695: Crash in libavformat/mov.c while playing a simple mp4 file
------------------------------------+------------------------------------
             Reporter:  dlin        |                    Owner:  (none)
                 Type:  defect      |                   Status:  closed
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:  invalid
             Keywords:  mov.c       |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
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Changes (by Marton Balint):

 * status:  new => closed
 * resolution:   => invalid

Comment:

 This is not a crash but only read of uninitialized value.

 This is the allocated data:

 {{{
     buf = av_malloc(num_bytes+AV_INPUT_BUFFER_PADDING_SIZE);
 }}}

 Only num_bytes are filled in the buffer, but the bitstream reader used on
 buf is allowed to overread, that is why extra padding is allocated. So the
 code is safe and uninitialized value is ignored later on.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9695#comment:1>
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