[FFmpeg-trac] #8260(undetermined:new): heap-buffer-overflow at libavfilter/vf_edgedetect.c:153

FFmpeg trac at avcodec.org
Sun Oct 13 17:48:33 EEST 2019

#8260: heap-buffer-overflow at libavfilter/vf_edgedetect.c:153
             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_edgedetect.c:153 in

 I compiled ffmpeg with "--toolchain=clang-asan" to check the memory
 corruption and attached log file.
 How to reproduce:
 % ffmpeg_g -y -i $PoC -filter_complex edgedetect -target dvd -loglevel 99

 ffmpeg version N-95336-g4f4334bcbc 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

 Here's ASAN log

 ==24040==ERROR: AddressSanitizer: heap-buffer-overflow on address
 0x60900000b681 at pc 0x0000004dcadc bp 0x7fffffffa750 sp 0x7fffffff9f00
 WRITE of size 1 at 0x60900000b681 thread T0
     #0 0x4dcadb in __asan_memcpy (ffmpeg_asan+0x4dcadb)
     #1 0xcd16cd in gaussian_blur ffmpeg/libavfilter/vf_edgedetect.c:153:5
     #2 0xcd16cd in filter_frame ffmpeg/libavfilter/vf_edgedetect.c:359
     #3 0x826e29 in ff_filter_activate_default
     #4 0x826e29 in ff_filter_activate ffmpeg/libavfilter/avfilter.c:1430
     #5 0x86fd22 in push_frame ffmpeg/libavfilter/buffersrc.c:187:15
     #6 0x86fd22 in av_buffersrc_add_frame_internal
     #7 0x86e762 in av_buffersrc_add_frame_flags
     #8 0x666407 in ifilter_send_frame ffmpeg/fftools/ffmpeg.c:2186:11
     #9 0x666407 in send_frame_to_filters ffmpeg/fftools/ffmpeg.c:2260
     #10 0x607666 in decode_video ffmpeg/fftools/ffmpeg.c:2459:11
     #11 0x607666 in process_input_packet ffmpeg/fftools/ffmpeg.c:2613
     #12 0x644c58 in process_input ffmpeg/fftools/ffmpeg.c:4303:23
     #13 0x5e7157 in transcode_step ffmpeg/fftools/ffmpeg.c:4628:11
     #14 0x5e7157 in transcode ffmpeg/fftools/ffmpeg.c:4682
     #15 0x5db65b in main ffmpeg/fftools/ffmpeg.c:4884:9
     #16 0x7ffff5c93b96 in __libc_start_main /build/glibc-
     #17 0x41def9 in _start (ffmpeg_asan+0x41def9)

 0x60900000b681 is located 0 bytes to the right of 1-byte region
 allocated by thread T0 here:
     #0 0x4de9e8 in posix_memalign (ffmpeg_asan+0x4de9e8)
     #1 0x8598211 in av_malloc ffmpeg/libavutil/mem.c:87:9
     #2 0xcdc71c in config_props ffmpeg/libavfilter/vf_edgedetect.c:137:29

 SUMMARY: AddressSanitizer: heap-buffer-overflow (ffmpeg_asan+0x4dcadb) in

 Please confirm.

Ticket URL: <https://trac.ffmpeg.org/ticket/8260>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker

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