Opened 3 years ago

Closed 3 years ago

#8289 closed defect (fixed)

left shift of 1 by 31 places cannot be represented in type 'int' at libavfilter/avf_abitscope.c:145

Reported by: Suhwan Owned by:
Priority: normal Component: undetermined
Version: git-master Keywords: ubsan
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no


Summary of the bug:
There is a left shift of 1 by 31 places cannot be represented in type 'int' at libavfilter/avf_abitscope.c:145

I compiled ffmpeg with "--toolchain=clang-usan" to check the undefined-behaviours and attached log file.
How to reproduce:

% ffmpeg_g -y -i $PoC -filter_complex abitscope -loglevel 0 tmp.rm

ffmpeg version N-95399-g1a0c584abc Copyright (c) 2000-2019 the FFmpeg developers
built with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
configuration: --cc=clang --cxx=clang++ --ld=clang --enable-debug --toolchain=clang-usan

Here's UBSAN log

libavfilter/avf_abitscope.c:145:25: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'

Thread 1 "ffmpeg_g" hit Breakpoint 1, 0x00000000004288b0 in __ubsan::ScopedReport::~ScopedReport() ()
(gdb) bt
#0  0x00000000004288b0 in __ubsan::ScopedReport::~ScopedReport() ()
#1  0x000000000042a9a0 in handleShiftOutOfBoundsImpl(__ubsan::ShiftOutOfBoundsData*, unsigned long, unsigned long, __ubsan::ReportOptions) ()
#2  0x000000000042cb41 in __ubsan_handle_shift_out_of_bounds ()
#3  0x000000000050e01c in count_bits (s=0x9412b80, sample=4294967265, max=<optimized out>) at libavfilter/avf_abitscope.c:145
#4  0x000000000050bcb7 in filter_frame (inlink=<optimized out>, insamples=<optimized out>) at libavfilter/avf_abitscope.c:203
#5  activate (ctx=<optimized out>) at libavfilter/avf_abitscope.c:238
#6  0x00000000005ce2ec in ff_filter_activate (filter=<optimized out>) at libavfilter/avfilter.c:1442
#7  0x00000000005f42bf in push_frame (graph=0x93c6200) at libavfilter/buffersrc.c:187
#8  av_buffersrc_add_frame_internal (ctx=<optimized out>, frame=0x9405640, flags=<optimized out>) at libavfilter/buffersrc.c:261
#9  0x00000000005f2e7e in av_buffersrc_add_frame_flags (ctx=0x9413100, frame=0x9405640, flags=4) at libavfilter/buffersrc.c:170
#10 0x00000000004cad60 in ifilter_send_frame (ifilter=<optimized out>, frame=<optimized out>) at fftools/ffmpeg.c:2186
#11 send_frame_to_filters (ist=0x93b45c0, decoded_frame=0x9405400) at fftools/ffmpeg.c:2260
#12 0x000000000049ba81 in decode_audio (ist=<optimized out>, pkt=<optimized out>, got_output=<optimized out>, decode_failed=<optimized out>) at fftools/ffmpeg.c:2327
#13 process_input_packet (ist=<optimized out>, pkt=0x7fffffffc9b0, no_eof=0) at fftools/ffmpeg.c:2609
#14 0x00000000004bf0f0 in process_input (file_index=<optimized out>) at fftools/ffmpeg.c:4508
#15 0x000000000048d5eb in transcode_step () at fftools/ffmpeg.c:4628
#16 transcode () at fftools/ffmpeg.c:4682
#17 0x0000000000487da4 in main (argc=9, argv=<optimized out>) at fftools/ffmpeg.c:4884

Please confirm.

Attachments (1)

PoC_avf_abitscope_145.wma (324.9 KB ) - added by Suhwan 3 years ago.

Download all attachments as: .zip

Change History (2)

by Suhwan, 3 years ago

Attachment: PoC_avf_abitscope_145.wma added


comment:1 by Elon Musk, 3 years ago

Resolution: fixed
Status: newclosed
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