[Ffmpeg-devel] fuzzer bugs

Jindrich Makovicka makovick
Tue Jan 16 11:07:46 CET 2007

On 1/15/07, Diego Biurrun <diego at biurrun.de> wrote:
> Hi,
> Samuel Hocevar wrote his own fuzzer and let it loose on some multimedia
> players:
> http://sam.zoy.org/zzuf/
> ffplay shows quite a few crashes, MPlayer as well, some of which are
> related to FFmpeg.  No time for details right now, but it's easy enough
> to reproduce and the samples are tiny.

MPlayer's mpeg1 sample (http://sam.zoy.org/zzuf/lol-mplayer.mpg) may
actually expose a bug in ffmpeg h264 decoder:

[h264 @ 0x869b678]insane cropping not completely supported, this could
look slightly wrong ...
[h264 @ 0x869b678]Unknown NAL code: 15
[h264 @ 0x869b678]Unknown NAL code: 16
[h264 @ 0x869b678]Unknown NAL code: 0
[h264 @ 0x869b678]slice type too large (0) at 0 0
[h264 @ 0x869b678]decode_slice_header error
[h264 @ 0x869b678]non existing PPS referenced
[h264 @ 0x869b678]decode_slice_header error
==7924== Jump to the invalid address stated on the next line
==7924==    at 0x0: ???
==7924==    by 0x83FF46C: decode_slice (h264.c:7372)
==7924==    by 0x84001C4: decode_nal_units (h264.c:8075)
==7924==    by 0x840125C: decode_frame (h264.c:8218)
==7924==    by 0x82474BF: avcodec_decode_video (utils.c:904)
==7924==    by 0x812BA92: decode (vd_ffmpeg.c:774)
==7924==    by 0x80F3235: decode_video (dec_video.c:355)
==7924==    by 0x8098620: main (mplayer.c:3440)
==7924==  Address 0x0 is not stack'd, malloc'd or (recently) free'd

Jindrich Makovicka

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