On Mon, Dec 06, 2021 at 11:23:12AM +0100, Anton Khirnov wrote: > Quoting Michael Niedermayer (2021-12-03 18:19:54) > > Fixes: Integer overflow > > Fixes: > > 40973/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-6739312704618496 > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavcodec/apedec.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c > > index 9c723f29977..5c3261cf5cb 100644 > > --- a/libavcodec/apedec.c > > +++ b/libavcodec/apedec.c > > @@ -1337,7 +1337,7 @@ static void do_apply_filter(APEContext *ctx, int > > version, APEFilter *f, > > absres = FFABSU(res); > > if (absres) > > *f->adaptcoeffs = APESIGN(res) * > > - (8 << ((absres > f->avg * 3LL) + (absres > > > (f->avg + f->avg / 3)))); > > + (8 << ((absres > f->avg * 3LL) + (absres > > > ((int64_t)f->avg + f->avg / 3)))); > > /* equivalent to the following code > > if (absres <= f->avg * 4 / 3) > > *f->adaptcoeffs = APESIGN(res) * 8; > > -- > > 2.17.1 > > Does this not assume a 32bit int?
hmm you mean avg could overflow 64bit ? iam not sure that can happen but we could make avg int32 or uint32 ? thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB It is dangerous to be right in matters on which the established authorities are wrong. -- Voltaire
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