#10749: SEGV bug at libavfilter/avf_showspectrum.c:1789:52 in
showspectrumpic_request_frame in FFmpeg
-------------------------------------+-------------------------------------
Reporter: | Type: defect
ZengYunxiang |
Status: new | Priority: important
Component: avfilter | Version: git-
| master
Keywords: bugs | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
Dear developers,
We found the following SEGV bug on FFmpeg(version N-113007-g8d24a28d06)
when using showspectrumpic filter, please confirm.
The poc file(poc15ffmpeg) will be attached to this ticket.
How to reproduce:
{{{
git clone https://github.com/FFmpeg/FFmpeg.git ffmpeg
cd ffmpeg
./configure --cc=clang --cxx=clang++ --ld=clang --enable-debug --toolchain
=clang-asan
make -j30
./ffmpeg_g -y -i poc15ffmpeg -filter_complex showspectrumpic tmp.mp4
}}}
ASAN Log:
{{{
AddressSanitizer:DEADLYSIGNAL
=================================================================
==439689==ERROR: AddressSanitizer: SEGV on unknown address (pc
0x560d7ae3c30f bp 0x7f1dc3afb580 sp 0x7f1dc3afb380 T3)
==439689==The signal is caused by a READ memory access.
==439689==Hint: this fault was caused by a dereference of a high value
address (see register values below). Disassemble the provided pc to learn
which register was used.
#0 0x560d7ae3c30f in showspectrumpic_request_frame
/ffmpeg/libavfilter/avf_showspectrum.c:1789:52
#1 0x560d7ae552f6 in ff_request_frame_to_filter
/ffmpeg/libavfilter/avfilter.c:482:15
#2 0x560d7ae51676 in forward_status_change
/ffmpeg/libavfilter/avfilter.c:1147:19
#3 0x560d7ae51676 in ff_filter_activate_default
/ffmpeg/libavfilter/avfilter.c:1188:20
#4 0x560d7ae51676 in ff_filter_activate
/ffmpeg/libavfilter/avfilter.c:1341:11
#5 0x560d7ae64817 in push_frame /ffmpeg/libavfilter/buffersrc.c:168:15
#6 0x560d7ae64817 in av_buffersrc_close
/ffmpeg/libavfilter/buffersrc.c:286:47
#7 0x560d7ad51263 in send_eof /ffmpeg/fftools/ffmpeg_filter.c:2546:15
#8 0x560d7ad51263 in filter_thread
/ffmpeg/fftools/ffmpeg_filter.c:2811:19
#9 0x560d7ad93c18 in task_wrapper
/ffmpeg/fftools/ffmpeg_sched.c:2200:21
#10 0x7f1dc6c1eac2 (/lib/x86_64-linux-gnu/libc.so.6+0x94ac2)
(BuildId: a43bfc8428df6623cd498c9c0caeb91aec9be4f9)
#11 0x7f1dc6cb0a3f (/lib/x86_64-linux-gnu/libc.so.6+0x126a3f)
(BuildId: a43bfc8428df6623cd498c9c0caeb91aec9be4f9)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV
/ffmpeg/libavfilter/avf_showspectrum.c:1789:52 in
showspectrumpic_request_frame
Thread T3 (fc0) created by T0 here:
#0 0x560d7acdff9c in __interceptor_pthread_create
(/ffmpeg/ffmpeg_g+0x90cf9c) (BuildId:
8d6ccf457a75d047d11f9627d0b67208c2215c8c)
#1 0x560d7ad8e161 in task_start /ffmpeg/fftools/ffmpeg_sched.c:403:11
#2 0x560d7adace68 in transcode /ffmpeg/fftools/ffmpeg.c:922:11
#3 0x560d7adace68 in main /ffmpeg/fftools/ffmpeg.c:1050:11
#4 0x7f1dc6bb3d8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f) (BuildId:
a43bfc8428df6623cd498c9c0caeb91aec9be4f9)
==439689==ABORTING
}}}
ffmpeg version:
{{{
# ./ffmpeg -version
ffmpeg version N-113007-g8d24a28d06 Copyright (c) 2000-2023 the FFmpeg
developers
built with Ubuntu clang version 14.0.0-1ubuntu1.1
configuration: --cc=clang --cxx=clang++ --ld=clang --enable-debug
--toolchain=clang-asan
libavutil 58. 34.100 / 58. 34.100
libavcodec 60. 35.100 / 60. 35.100
libavformat 60. 18.100 / 60. 18.100
libavdevice 60. 4.100 / 60. 4.100
libavfilter 9. 14.100 / 9. 14.100
libswscale 7. 6.100 / 7. 6.100
libswresample 4. 13.100 / 4. 13.100
}}}
Credit:
{{{
Discovered by Zeng Yunxiang.
}}}
Thanks for your time!
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10749>
FFmpeg <https://ffmpeg.org>
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