On Fri, Sep 11, 2020 at 10:00:02PM +0200, Paul B Mahol wrote: > On Fri, Sep 11, 2020 at 08:09:48PM +0200, Michael Niedermayer wrote: > > On Fri, Sep 11, 2020 at 11:12:33AM +0200, Paul B Mahol wrote: > > > On Fri, Sep 11, 2020 at 01:19:59AM +0200, Michael Niedermayer wrote: > > > > Fixes: index -1 out of bounds for type 'const uint8_t [6][16]' > > > > Fixes: out of array read > > > > Fixes: shift exponent -21 is negative > > > > Fixes: > > > > 25422/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MOBICLIP_fuzzer-5748258226569216 > > > > Fixes: shift exponent 8039082 is too large for 32-bit type 'int' > > > > Fixes: > > > > 25430/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MOBICLIP_fuzzer-5698567770210304 > > > > > > > > Found-by: continuous fuzzing process > > > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > > > --- > > > > libavcodec/mobiclip.c | 6 +++++- > > > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/libavcodec/mobiclip.c b/libavcodec/mobiclip.c > > > > index d147eddbae..13f0edc89d 100644 > > > > --- a/libavcodec/mobiclip.c > > > > +++ b/libavcodec/mobiclip.c > > > > @@ -1323,6 +1323,10 @@ static int mobiclip_decode(AVCodecContext > > > > *avctx, void *data, > > > > } > > > > } else { > > > > MotionXY *motion = s->motion; > > > > + int quantizer = s->quantizer + get_se_golomb(gb); > > > > + > > > > + if (quantizer < 12 || quantizer > 161) > > > > > > From where this numbers come? > > > > It comes from the implementation > > qtab is int and will overflow beyond 161 > > ok then.
will apply thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Modern terrorism, a quick summary: Need oil, start war with country that has oil, kill hundread thousand in war. Let country fall into chaos, be surprised about raise of fundamantalists. Drop more bombs, kill more people, be surprised about them taking revenge and drop even more bombs and strip your own citizens of their rights and freedoms. to be continued
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