#8139: load of misaligned address in libavcodec/startcode.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 two UBSAN errors, which are load of misaligned address for type
'const uint64_t' (aka 'const unsigned long'), which requires 8 byte
alignment
{{{
libavcodec/startcode.c:41:17: runtime error: load of misaligned address
0x619000000a81 for type 'const uint64_t' (aka 'const unsigned long'),
which requires 8 byte alignment
0x619000000a81: note: pointer points here
00 80 2b 68 65 61 64 09 31 2e 31 3b 0a 61 63 63 65 73 73 3b 0a 73 79
6d 62 6f 6c 73 3b 0a 6c 6f
^
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
libavcodec/startcode.c:41:17 in
libavcodec/startcode.c:42:22: runtime error: load of misaligned address
0x619000000a81 for type 'const uint64_t' (aka 'const unsigned long'),
which requires 8 byte alignment
0x619000000a81: note: pointer points here
00 80 2b 68 65 61 64 09 31 2e 31 3b 0a 61 63 63 65 73 73 3b 0a 73 79
6d 62 6f 6c 73 3b 0a 6c 6f
^
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
libavcodec/startcode.c:42:22 in
}}}
How to reproduce:
{{{
% ./ffmpeg_g -t 2 -y -i samples/h264/station.1080p.h264 -loglevel 99
-target dvd -map 0 -disposition: v:75 wmv2 -vframes 77 -r 108 -ab 868k
-b:v 251k output/tmp.webm_dash_manifest
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/8139>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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