[FFmpeg-trac] #8294(undetermined:new): memory leaks in avpriv_float_dsp_alloc()

FFmpeg trac at avcodec.org
Thu Oct 17 09:48:53 EEST 2019


#8294: memory leaks in avpriv_float_dsp_alloc()
-------------------------------------+-------------------------------------
             Reporter:  Suhwan       |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 There are memory leaks in avpriv_float_dsp_alloc()
 How to reproduce:
 {{{
 % ffmpeg_g -y  -i $PoC -loglevel 0 -psnr tmp.eac3

 ffmpeg version N-95425-g1e35519fe0 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
 }}}

 Here's Valgrind log

 {{{
 ==16402== HEAP SUMMARY:
 ==16402==     in use at exit: 120 bytes in 2 blocks
 ==16402==   total heap usage: 889 allocs, 887 frees, 2,885,023 bytes
 allocated
 ==16402==
 ==16402== 88 bytes in 1 blocks are definitely lost in loss record 2 of 2
 ==16402==    at 0x9FDFE76: memalign (in /usr/lib/valgrind
 /vgpreload_memcheck-amd64-linux.so)
 ==16402==    by 0x9FDFF91: posix_memalign (in /usr/lib/valgrind
 /vgpreload_memcheck-amd64-linux.so)
 ==16402==    by 0x592C189: av_malloc (mem.c:87)
 ==16402==    by 0x592C189: av_mallocz (mem.c:238)
 ==16402==    by 0x58FC61E: avpriv_float_dsp_alloc (float_dsp.c:137)
 ==16402==    by 0x44EB76E: ff_ac3_float_encode_init (ac3enc_float.c:135)
 ==16402==    by 0x346DC34: avcodec_open2 (utils.c:946)
 ==16402==    by 0x4A6841: init_output_stream (ffmpeg.c:3507)
 ==16402==    by 0x4BFFE5: reap_filters (ffmpeg.c:1442)
 ==16402==    by 0x48D661: transcode_step (ffmpeg.c:4638)
 ==16402==    by 0x48D661: transcode (ffmpeg.c:4682)
 ==16402==    by 0x487DA3: main (ffmpeg.c:4884)
 ==16402==
 ==16402== LEAK SUMMARY:
 ==16402==    definitely lost: 88 bytes in 1 blocks
 ==16402==    indirectly lost: 0 bytes in 0 blocks
 ==16402==      possibly lost: 0 bytes in 0 blocks
 ==16402==    still reachable: 32 bytes in 1 blocks
 ==16402==         suppressed: 0 bytes in 0 blocks
 ==16402== Reachable blocks (those to which a pointer was found) are not
 shown.
 ==16402== To see them, rerun with: --leak-check=full --show-leak-kinds=all
 ==16402==
 ==16402== For counts of detected and suppressed errors, rerun with: -v
 ==16402== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)

 }}}

 ASAN log.
 {{{
 =================================================================
 ==33197==ERROR: LeakSanitizer: detected memory leaks

 Direct leak of 88 byte(s) in 1 object(s) allocated from:
     #0 0x4de9e8 in posix_memalign (ffmpeg_usan+0x4de9e8)
     #1 0x85c2178 in av_malloc ffmpeg/libavutil/mem.c:87:9
     #2 0x85c2178 in av_mallocz ffmpeg/libavutil/mem.c:238
     #3 0x85651c0 in avpriv_float_dsp_alloc
 ffmpeg/libavutil/float_dsp.c:137:31

 SUMMARY: AddressSanitizer: 88 byte(s) leaked in 1 allocation(s).

 }}}
 Please confirm.
 Thanks

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8294>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


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