[FFmpeg-trac] #5060(avcodec:new): signed integer overflow in decode_cabac_residual_internal

FFmpeg trac at avcodec.org
Fri Dec 4 23:19:49 CET 2015


#5060: signed integer overflow in decode_cabac_residual_internal
---------------------------------+--------------------------------------
             Reporter:  tsmith   |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  git-master
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+--------------------------------------
 Summary of the bug:

 This is an Undefined behavior sanitizer (UBSan) runtime error.

 libavcodec/h264_cabac.c:1755:9: runtime error: signed integer overflow:
 2147483647 + 14 cannot be represented in type 'int'
     #0 0x17ec392 in decode_cabac_residual_internal
 /home/user/code/ffmpeg/libavcodec/h264_cabac.c:1755:9
     #1 0x17ec392 in decode_cabac_residual_nondc_internal
 /home/user/code/ffmpeg/libavcodec/h264_cabac.c:1795
     #2 0x17b00ec in decode_cabac_residual_nondc
 /home/user/code/ffmpeg/libavcodec/h264_cabac.c:1856:5
     #3 0x17b00ec in decode_cabac_luma_residual
 /home/user/code/ffmpeg/libavcodec/h264_cabac.c:1878
     #4 0x17b00ec in ff_h264_decode_mb_cabac
 /home/user/code/ffmpeg/libavcodec/h264_cabac.c:2403
     #5 0x96cad2 in decode_slice
 /home/user/code/ffmpeg/libavcodec/h264_slice.c:2404:23
     #6 0x9697d2 in ff_h264_execute_decode_slices
 /home/user/code/ffmpeg/libavcodec/h264_slice.c:2567:15
     #7 0x7a1dcc in decode_nal_units
 /home/user/code/ffmpeg/libavcodec/h264.c:1655:23
     #8 0x7b4469 in h264_decode_frame
 /home/user/code/ffmpeg/libavcodec/h264.c:1840:17
     #9 0xe89945 in avcodec_decode_video2
 /home/user/code/ffmpeg/libavcodec/utils.c:2105:19
     #10 0x756b2d in try_decode_frame
 /home/user/code/ffmpeg/libavformat/utils.c:2752:19
     #11 0x7434ab in avformat_find_stream_info
 /home/user/code/ffmpeg/libavformat/utils.c:3401:9
     #12 0x507779 in open_input_file
 /home/user/code/ffmpeg/ffmpeg_opt.c:970:11
     #13 0x50365f in open_files /home/user/code/ffmpeg/ffmpeg_opt.c:2939:15
     #14 0x502706 in ffmpeg_parse_options
 /home/user/code/ffmpeg/ffmpeg_opt.c:2976:11
     #15 0x57ab79 in main /home/user/code/ffmpeg/ffmpeg.c:4273:11
     #16 0x7f965275eec4 in __libc_start_main /build/buildd/eglibc-2.19/csu
 /libc-start.c:287
     #17 0x41ad25 in _start (/home/user/Desktop/ffmpeg/ffmpeg_ub+0x41ad25)

 How to reproduce:
 {{{
 % ./ffmpeg -v 0 -nostats -f h264 -i test_case.264 -f null -
 ffmpeg version N-76984-g259c71c
 built on Linux x86_64
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5060>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


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