[FFmpeg-trac] #6150(avcodec:new): msmpeg4dec.c ff_msmpeg4_decode_init crash issue

[FFmpeg]

#6150: msmpeg4dec.c ff_msmpeg4_decode_init crash issue
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             Reporter:  wqmffmpeg  |                     Type:  defect
               Status:  new        |                 Priority:  critical
            Component:  avcodec    |                  Version:  3.1.5
             Keywords:             |               Blocked By:
             Blocking:             |  Reproduced by developer:  1
Analyzed by developer:  0          |
-----------------------------------+------------------------------------
 Summary of the bug:
 How to reproduce:
 I built ffmpeg(3.1.3) binary in my mobile phone
 play ac3_vc1_fengjing_002.ts(vc1+ac3) by ffmpeg, then
 ff_msmpeg4_decode_init() crash
 from backtrace,  crash happen in below source code:
 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
                  &ff_msmp4_mb_i_table[0][1], 4, 2,
                  &ff_msmp4_mb_i_table[0][0], 4, 2, 536);

 Backtrace:
     #00 pc 00070692  /system/lib/libavcodec.so
 (ff_msmpeg4_decode_init+1237)
     #01 pc 0007ca4f  /system/lib/libavcodec.so
     #02 pc 002cbd99  /system/lib/libavcodec.so (avcodec_open2+1804)
     #03 pc 000c1125  /system/lib/libavformat.so
     #04 pc 000c5c17  /system/lib/libavformat.so
 (avformat_find_stream_info+2558)

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Ticket URL: <https://trac.ffmpeg.org/ticket/6150>
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