[FFmpeg-trac] #5130(avcodec:new): left shift of negative value in mc_chroma_unscaled()
FFmpeg
trac at avcodec.org
Thu Jan 7 02:28:17 CET 2016
#5130: left shift of negative value in mc_chroma_unscaled()
---------------------------------+--------------------------------------
Reporter: tsmith | Type: defect
Status: new | Priority: normal
Component: avcodec | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
---------------------------------+--------------------------------------
Summary of the bug:
UBSan: libavcodec/vp9.c:2758:44: runtime error: left shift of negative
value -23
How to reproduce:
{{{
% ffmpeg -f ivf -i <test_case> -f null -
ffmpeg version N-77718-g72673ad Copyright (c) 2000-2016 the FFmpeg
developers
built with Ubuntu clang version 3.7.1-svn253742-1~exp1
(branches/release_37) (based on LLVM 3.7.1)
configuration: --cc=clang --cxx=clang++ --disable-libxcb --disable-xlib
--disable-logging --disable-ffprobe --disable-ffplay --disable-sdl
--disable-ffserver --disable-doc --disable-pthreads --disable-network
--disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-
vdpau --disable-stripping --disable-runtime-cpudetect --disable-
securetransport --disable-iconv
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 22.100 / 57. 22.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
[vp9 @ 0x619000005a80] Warning: not compiled with thread support, using
thread emulation
Input #0, ivf, from
'/home/user/Desktop/vpx/corpus/bb6b5274722c3805b0dc5a19d48291090d050f1f':
Duration: 00:18:12.33, bitrate: N/A
Stream #0:0: Video: vp9 (Profile 0) (VP90 / 0x30395056), yuv420p(tv),
320x240, 30 tbr, 30 tbn, 30 tbc
[wrapped_avframe @ 0x619000003780] Warning: not compiled with thread
support, using thread emulation
[vp9 @ 0x619000004180] Warning: not compiled with thread support, using
thread emulation
Output #0, null, to 'pipe:':
Metadata:
encoder : Lavf57.21.101
Stream #0:0: Video: wrapped_avframe, yuv420p, 320x240, q=2-31, 200
kb/s, 30 fps, 30 tbn, 30 tbc
Metadata:
encoder : Lavc57.22.100 wrapped_avframe
Stream mapping:
Stream #0:0 -> #0:0 (vp9 (native) -> wrapped_avframe (native))
Press [q] to stop, [?] for help
libavcodec/vp9.c:2758:44: runtime error: left shift of negative value -23
#0 0x1e09c53 in mc_chroma_unscaled
/home/user/code/ffmpeg/libavcodec/vp9.c:2769:34
#1 0x1e09c53 in inter_pred_8bpp
/home/user/code/ffmpeg/libavcodec/vp9_mc_template.c:427
#2 0x1ca28a7 in inter_recon
/home/user/code/ffmpeg/libavcodec/vp9.c:2986:13
#3 0x1ca28a7 in inter_recon_8bpp
/home/user/code/ffmpeg/libavcodec/vp9.c:3040
#4 0x1ca28a7 in decode_b /home/user/code/ffmpeg/libavcodec/vp9.c:3294
#5 0x1c901e5 in decode_sb
/home/user/code/ffmpeg/libavcodec/vp9.c:3392:17
#6 0x1c75f55 in vp9_decode_frame
/home/user/code/ffmpeg/libavcodec/vp9.c:4164:29
#7 0x1a3fc96 in avcodec_decode_video2
/home/user/code/ffmpeg/libavcodec/utils.c:2107:19
#8 0x589546 in decode_video /home/user/code/ffmpeg/ffmpeg.c:2069:11
#9 0x589546 in process_input_packet
/home/user/code/ffmpeg/ffmpeg.c:2318
#10 0x5990bc in process_input /home/user/code/ffmpeg/ffmpeg.c:3980:5
#11 0x5726c6 in transcode_step /home/user/code/ffmpeg/ffmpeg.c:4068:11
#12 0x5726c6 in transcode /home/user/code/ffmpeg/ffmpeg.c:4122
#13 0x56f73c in main /home/user/code/ffmpeg/ffmpeg.c:4314:9
#14 0x7f30cf98eec4 in __libc_start_main /build/buildd/eglibc-2.19/csu
/libc-start.c:287
#15 0x466445 in _start
(/home/user/Desktop/ffmpeg/ffmpeg_full+0x466445)
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5130>
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