[FFmpeg-trac] #8146(undetermined:new): left shift of negative value bug in libswscale/input.c
FFmpeg
trac at avcodec.org
Sun Sep 15 06:23:16 EEST 2019
#8146: left shift of negative value bug in libswscale/input.c
-------------------------------------+-------------------------------------
Reporter: Suhwan | Type: defect
Status: new | Priority: important
Component: | Version: git-
undetermined | master
Keywords: ubsan | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
There're 4 left shift of negative value bugs in libswscale/input.c
{{{
libswscale/input.c:289:42: runtime error: left shift of negative value
-4865
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
libswscale/input.c:289:42 in
libswscale/input.c:289:71: runtime error: left shift of negative value
-9528
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
libswscale/input.c:289:71 in
libswscale/input.c:290:71: runtime error: left shift of negative value
-12061
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
libswscale/input.c:290:71 in
libswscale/input.c:290:100: runtime error: left shift of negative value
-2332
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
libswscale/input.c:290:100 in
}}}
How to reproduce:
{{{
% ./ffmpeg_g -stream_loop 1 -y -r 41 -i msvc.avi -target svcd -map 0
-aframes 68 -r 76 -ar 22050 -ac 18 -b:v 455k output/tmp.spdif
ffmpeg version N-94887-ge55018ee11 (git master)
built on ... ubuntu 18.04 with clang-6 and UBSAN option.
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8146>
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