[FFmpeg-trac] #8324(undetermined:new): signed integer overflow at libavfilter/vf_premultiply.c:212
FFmpeg
trac at avcodec.org
Tue Oct 22 10:38:55 EEST 2019
#8324: signed integer overflow at libavfilter/vf_premultiply.c:212
-------------------------------------+-------------------------------------
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:
I compiled ffmpeg with "--toolchain=clang-usan" to check the undefined-
behaviours and attached log file.
How to reproduce:
{{{
% ffmpeg_g -t 1 -y -i $PoC1 -i $PoC2 -filter_complex premultiply -target
vcd -loglevel 0 tmp.hnm
ffmpeg version N-95517-g0b8956b25c 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/vf_premultiply.c:212:44: runtime error: signed integer
overflow: 61187 * 37008 cannot be represented in type 'int'
[Switching to Thread 0x7fffdf7ee700 (LWP 1202)]
Thread 37 "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 0x000000000042c9df in __ubsan_handle_mul_overflow ()
#3 0x0000000000cdaf16 in premultiply16offset (mmsrc=<optimized out>,
aasrc=<optimized out>,
ddst=<optimized out>, mlinesize=<optimized out>, alinesize=<optimized
out>, dlinesize=<optimized out>,
w=60, h=1, half=32768, shift=16, offset=4096) at
libavfilter/vf_premultiply.c:212
#4 0x0000000000cdd599 in premultiply_slice (ctx=<optimized out>,
arg=<optimized out>, jobnr=<optimized out>,
nb_jobs=<optimized out>) at libavfilter/vf_premultiply.c:390
#5 0x00000000006635d5 in worker_func (priv=0x93cd600, jobnr=12,
threadnr=<optimized out>,
nb_jobs=<optimized out>, nb_threads=<optimized out>) at
libavfilter/pthread.c:50
#6 0x00000000059e73e8 in run_jobs (ctx=0x93d0300) at
libavutil/slicethread.c:61
#7 0x00000000059e61f6 in thread_worker (v=<optimized out>) at
libavutil/slicethread.c:85
#8 0x00007ffff668e6db in start_thread (arg=0x7fffdf7ee700) at
pthread_create.c:463
#9 0x00007ffff5d9388f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb) q
}}}
Please confirm.
Thanks
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8324>
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