[FFmpeg-trac] #8236(undetermined:new): heap-buffer-overflow at libavfilter/vf_floodfill.c

FFmpeg trac at avcodec.org
Thu Oct 10 21:25:39 EEST 2019

#8236: heap-buffer-overflow at libavfilter/vf_floodfill.c
             Reporter:  Suhwan       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  asan         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Summary of the bug:
 There is a heap-buffer-overflow at libavfilter/vf_floodfill.c:333:45
 ==48454==ERROR: AddressSanitizer: heap-buffer-overflow on address
 0x63000000e500 at pc 0x000002605a3c bp 0x7fff562c7d50 sp 0x7fff562c7d48
 WRITE of size 2 at 0x63000000e500 thread T0
     #0 0x2605a3b in filter_frame ffmpeg/libavfilter/vf_floodfill.c:333:45
     #1 0x113d8c8 in ff_filter_activate_default
     #2 0x113d8c8 in ff_filter_activate ffmpeg/libavfilter/avfilter.c:1430
     #3 0x125d263 in push_frame ffmpeg/libavfilter/buffersrc.c:187:15
     #4 0x125d263 in av_buffersrc_add_frame_internal
     #5 0x1257ecc in av_buffersrc_add_frame_flags
     #6 0xa427a8 in ifilter_send_frame ffmpeg/fftools/ffmpeg.c:2196:11
     #7 0xa427a8 in send_frame_to_filters ffmpeg/fftools/ffmpeg.c:2270
     #8 0x8c4e27 in decode_video ffmpeg/fftools/ffmpeg.c:2469:11
     #9 0x8c4e27 in process_input_packet ffmpeg/fftools/ffmpeg.c:2623
     #10 0x9d5063 in process_input ffmpeg/fftools/ffmpeg.c:4518:5
     #11 0x847996 in transcode_step ffmpeg/fftools/ffmpeg.c:4638:11
     #12 0x847996 in transcode ffmpeg/fftools/ffmpeg.c:4692
     #13 0x81cf5f in main ffmpeg/fftools/ffmpeg.c:4894:9
     #14 0x7fd5916a6b96 in __libc_start_main /build/glibc-
     #15 0x41def9 in _start (ffmpeg_usan+0x41def9)

 0x63000000e500 is located 0 bytes to the right of 57600-byte region
 allocated by thread T0 here:
     #0 0x4de9e8 in posix_memalign (ffmpeg_usan+0x4de9e8)
     #1 0x1fd86a19 in av_malloc ffmpeg/libavutil/mem.c:87:9
     #2 0x1fd86a19 in av_mallocz ffmpeg/libavutil/mem.c:238
     #3 0x1fd86a19 in av_calloc ffmpeg/libavutil/mem.c:248
     #4 0x2608e4c in config_input ffmpeg/libavfilter/vf_floodfill.c:272:17

 SUMMARY: AddressSanitizer: heap-buffer-overflow
 ffmpeg/libavfilter/vf_floodfill.c:333:45 in filter_frame
 How to reproduce:
 % ffmpeg_g -stream_loop 5 -y -i $PoC -filter_complex floodfill -target dvd
 -loglevel 0 -map 0 -vbsf null -c:a:119 dvdsub -disposition:v:62 alias_pix
 -ab 282k -ac 27 -b:v 590k tmp.mpjpeg

 ffmpeg version N-95291-g5345965b3f Copyright (c) 2000-2019 the FFmpeg
 built with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
 configuration: --cc=clang --cxx=clang++ --ld=clang --enable-debug

Ticket URL: <https://trac.ffmpeg.org/ticket/8236>
FFmpeg <https://ffmpeg.org>
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