[FFmpeg-trac] #8167(undetermined:new): left shift of negative value bugs in libavcodec/motion_est_template.c

FFmpeg trac at avcodec.org
Mon Sep 16 19:25:35 EEST 2019


#8167: left shift of negative value bugs in libavcodec/motion_est_template.c
-------------------------------------+-------------------------------------
             Reporter:  Suhwan       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  ubsan        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 There're two left shift of negative value bugs in
 libavcodec/motion_est_template.c
 {{{
 libavcodec/motion_est_template.c:160:14: runtime error: left shift of
 negative value -1
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavcodec/motion_est_template.c:160:14 in
 libavcodec/motion_est_template.c:161:14: runtime error: left shift of
 negative value -2
 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
 libavcodec/motion_est_template.c:161:14 in
 }}}

 How to reproduce:
 {{{
 % ./ffmpeg_g -t 2 -y -r 90 -i Freh7_B.264 -map 0 -vframes 120 -aframes 84
 -r 79 -ab 847k -ac 12 -b:v 283k output/tmp.h261

 ffmpeg version N-94943-g1db6e47e85
 built on ubuntu 18.04 with clang-6 and UBSAN option.
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8167>
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