On Thu, Jan 12, 2023 at 09:11:35PM -0300, James Almer wrote: > > > On 1/12/2023 9:01 PM, Michael Niedermayer wrote: > > Fixes:OOM > > Fixes:out of array access (no testcase) > > Fixes: > > 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XPM_fuzzer-6573323838685184 > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavcodec/xpmdec.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/libavcodec/xpmdec.c b/libavcodec/xpmdec.c > > index ff1f51dd32..504cc47d8f 100644 > > --- a/libavcodec/xpmdec.c > > +++ b/libavcodec/xpmdec.c > > @@ -356,6 +356,9 @@ static int xpm_decode_frame(AVCodecContext *avctx, > > AVFrame *p, > > size *= 4; > > + if (size > SIZE_MAX) > > + return AVERROR(ENOMEM); > > Maybe check for (size > SIZE_MAX / 4) before the multiplication above > instead.
what is the advantage of this ? thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB it is not once nor twice but times without number that the same ideas make their appearance in the world. -- Aristotle
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