[FFmpeg-trac] #6388(avutil:new): MSan: use-of-uninitialized-value in ff_get_cpu_flags_x86()
FFmpeg
trac at avcodec.org
Sat May 13 07:45:41 EEST 2017
#6388: MSan: use-of-uninitialized-value in ff_get_cpu_flags_x86()
--------------------------------+--------------------------------------
Reporter: tsmith | Type: defect
Status: new | Priority: normal
Component: avutil | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
--------------------------------+--------------------------------------
How to reproduce:
Built with MSan or run with Valgrind
{{{
% ffmpeg -f ivf -i <test_case> -f null -
ffmpeg version N-86050-g0fbc7a2 Copyright (c) 2000-2017 the FFmpeg
developers
built with clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
configuration: --cc=clang --cxx=clang++ --disable-libxcb --disable-xlib
--disable-logging --disable-ffprobe --disable-ffplay --disable-sdl2
--disable-ffserver --disable-doc --disable-pthreads --disable-network
--disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-
vdpau --disable-stripping --disable-runtime-cpudetect --disable-postproc
--disable-securetransport --disable-iconv --disable-swscale --disable-
avdevice --disable-videotoolbox --disable-everything --enable-
encoder=wrapped_avframe --disable-lzma --enable-protocol='file,pipe'
--enable-muxer=null --enable-demuxer=ivf --enable-parser=vp9 --enable-
decoder=vp9 --disable-pic
% ffmpeg -f ivf -i <test_case> -f null -
ffmpeg version N-86050-g0fbc7a2 Copyright (c) 2000-2017 the FFmpeg
developers
built with clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
configuration: --cc=clang --cxx=clang++ --disable-libxcb --disable-xlib
--disable-logging --disable-ffprobe --disable-ffplay --disable-sdl2
--disable-ffserver --disable-doc --disable-pthreads --disable-network
--disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-
vdpau --disable-stripping --disable-runtime-cpudetect --disable-postproc
--disable-securetransport --disable-iconv --disable-swscale --disable-
avdevice --disable-videotoolbox --disable-everything --enable-
encoder=wrapped_avframe --disable-lzma --enable-protocol='file,pipe'
--enable-muxer=null --enable-demuxer=ivf --enable-parser=vp9 --enable-
decoder=vp9 --disable-pic
==21976==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0xea6be0 in ff_get_cpu_flags_x86 FFmpeg/libavutil/x86/cpu.c:106:9
#1 0xdd3651 in get_cpu_flags FFmpeg/libavutil/cpu.c:59:16
#2 0xdd3651 in av_get_cpu_flags FFmpeg/libavutil/cpu.c:93
#3 0xc2d18b in ff_vp9dsp_init_x86
FFmpeg/libavcodec/x86/vp9dsp_init.c:230:17
#4 0x7bfbe0 in update_size FFmpeg/libavcodec/vp9.c:205:9
#5 0x7bfbe0 in decode_frame_header FFmpeg/libavcodec/vp9.c:645
#6 0x7a77d8 in vp9_decode_frame FFmpeg/libavcodec/vp9.c:1113:16
#7 0x744fdc in decode_simple_internal
FFmpeg/libavcodec/decode.c:417:15
#8 0x744fdc in decode_simple_receive_frame
FFmpeg/libavcodec/decode.c:620
#9 0x744fdc in decode_receive_frame_internal
FFmpeg/libavcodec/decode.c:638
#10 0x741daa in avcodec_send_packet FFmpeg/libavcodec/decode.c:678:15
#11 0x6edb60 in try_decode_frame FFmpeg/libavformat/utils.c:3004:19
#12 0x6d98dc in avformat_find_stream_info
FFmpeg/libavformat/utils.c:3821:9
#13 0x4baedc in open_input_file FFmpeg/ffmpeg_opt.c:1013:11
#14 0x4b608c in open_files FFmpeg/ffmpeg_opt.c:3214:15
#15 0x4b521d in ffmpeg_parse_options FFmpeg/ffmpeg_opt.c:3254:11
#16 0x525f67 in main FFmpeg/ffmpeg.c:4771:11
#17 0x7fab6e3dd82f in __libc_start_main /build/glibc-
9tT8Do/glibc-2.23/csu/../csu/libc-start.c:291
#18 0x41a6a8 in _start (FFmpeg/ffmpeg+0x41a6a8)
Uninitialized value was created by an allocation of 'max_std_level' in
the stack frame of function 'ff_get_cpu_flags_x86'
#0 0xea5740 in ff_get_cpu_flags_x86 FFmpeg/libavutil/x86/cpu.c:91
built on Ubuntu 16.04 x64 with clang 3.8
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6388>
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