[FFmpeg-devel] [PATCH 2/4] tools/target_dec_fuzzer: Do not test AV_CODEC_FLAG2_FAST with AV_CODEC_ID_H264

[Michael Niedermayer]

On Thu, May 28, 2020 at 11:14:15AM +0200, Jean-Baptiste Kempf wrote:
> On Thu, May 28, 2020, at 00:08, Kieran Kunhya wrote:
> > On Wed, 27 May 2020 at 22:53, Michael Niedermayer <michael at niedermayer.cc>
> > wrote:
> > 
> > > On Sun, Mar 15, 2020 at 10:20:56PM +0100, Michael Niedermayer wrote:
> > > > This combination skips allocating large padding which can read out of
> > > array
> > > >
> > > > Fixes:
> > > 20978/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5746381832847360
> > > >
> > > > Found-by: continuous fuzzing process
> > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > > > Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> > > > ---
> > > >  tools/target_dec_fuzzer.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > will apply
> > >
> > 
> > Shouldn't there be warnings about FAST mode if it causes security issues?
> 
> I agree here.
> Either we fix FAST mode, or it must come with important warnings.

I suggest to add a AV_CODEC_FLAG2_FAST_UNSAFE and split the current
uses of the flag up between the 2

will submit a patch doing that unless i hear objections / a better
suggestion.


thx

[...]
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