[FFmpeg-trac] #8293(undetermined:new): signed integer overflow at libswscale/output.c:1852
FFmpeg
trac at avcodec.org
Wed Oct 16 20:12:11 EEST 2019
#8293: signed integer overflow at libswscale/output.c:1852
-------------------------------------+-------------------------------------
Reporter: Suhwan | Type: defect
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: ubsan | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
There is a signed integer overflow at libswscale/output.c:1852
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 allyuv -loglevel 0 -map 0 tmp.afc
ffmpeg version N-95405-g98ae6b0a4d 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
{{{
libswscale/output.c:1852:11: runtime error: signed integer overflow:
1169365504 + 981452800 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 0x000000000042b0eb in void
handleIntegerOverflowImpl<__ubsan::Value>(__ubsan::OverflowData*, unsigned
long, char const*, __ubsan::Value, __ubsan::ReportOptions) ()
#2 0x000000000042c8bf in __ubsan_handle_add_overflow ()
#3 0x00000000056a35f4 in yuv2rgb_write_full (c=<optimized out>,
Y=1169365504, A=0, U=<optimized out>, V=<optimized out>,
target=AV_PIX_FMT_RGB24, hasAlpha=0, dest=<optimized out>,
i=<optimized out>, y=<optimized out>, err=<optimized out>) at
libswscale/output.c:1852
#4 yuv2rgb_full_1_c_template (c=<optimized out>, buf0=<optimized out>,
ubuf=<optimized out>, vbuf=<optimized out>, abuf0=<optimized out>,
dest=<optimized out>, dstW=<optimized out>,
uvalpha=<optimized out>, y=<optimized out>, target=AV_PIX_FMT_RGB24,
hasAlpha=0) at libswscale/output.c:2103
#5 yuv2rgb24_full_1_c (c=0x93f0880, buf0=<optimized out>, ubuf=<optimized
out>, vbuf=<optimized out>, abuf0=<optimized out>, dest=<optimized out>,
dstW=4096, uvalpha=0, y=4)
at libswscale/output.c:2148
#6 0x000000000554d1fc in packed_vscale (c=<optimized out>,
desc=<optimized out>, sliceY=<optimized out>, sliceH=<optimized out>) at
libswscale/vscale.c:128
#7 0x0000000005516445 in swscale (c=<optimized out>, src=<optimized out>,
srcStride=<optimized out>, srcSliceY=<optimized out>, srcSliceH=<optimized
out>, dst=<optimized out>,
dstStride=<optimized out>) at libswscale/swscale.c:503
#8 0x00000000055209b2 in sws_scale (c=0x93f0880, srcSlice=0x93fa574,
srcStride=0x7fffffffc9a0, srcSliceY=0, srcSliceH=4096, dst=<optimized
out>, dstStride=0x7fffffffc990)
at libswscale/swscale.c:978
#9 0x0000000000d247ce in scale_slice (link=<optimized out>,
out_buf=<optimized out>, cur_pic=<optimized out>, sws=<optimized out>,
y=<optimized out>, h=<optimized out>, mul=<optimized out>,
field=<optimized out>) at libavfilter/vf_scale.c:411
#10 0x0000000000d2027d in scale_frame (link=<optimized out>, in=0xa19f240,
frame_out=<optimized out>) at libavfilter/vf_scale.c:535
#11 0x0000000000d1d7ed in filter_frame (link=0x93ed9c0, in=0xa19f240) at
libavfilter/vf_scale.c:549
#12 0x00000000005cfe9d in ff_filter_frame_framed (link=<optimized out>,
frame=0x0) at libavfilter/avfilter.c:1084
#13 ff_filter_frame_to_filter (link=<optimized out>) at
libavfilter/avfilter.c:1232
#14 ff_filter_activate_default (filter=<optimized out>) at
libavfilter/avfilter.c:1281
#15 ff_filter_activate (filter=<optimized out>) at
libavfilter/avfilter.c:1443
#16 0x00000000005eecd3 in get_frame_internal (ctx=0x93ed440,
frame=<optimized out>, flags=1, samples=<optimized out>) at
libavfilter/buffersink.c:110
#17 0x00000000005e254b in avfilter_graph_request_oldest (graph=0x93e0b00)
at libavfilter/avfiltergraph.c:1409
#18 0x000000000048c3a2 in transcode_from_filter (graph=0x93ae700,
best_ist=<optimized out>) at fftools/ffmpeg.c:4531
#19 transcode_step () at fftools/ffmpeg.c:4606
#20 transcode () at fftools/ffmpeg.c:4682
#21 0x0000000000487da4 in main (argc=11, argv=<optimized out>) at
fftools/ffmpeg.c:4884
}}}
Please confirm.
Thanks
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8293>
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