[FFmpeg-devel] [PATCH 1/2] avformat/hls: Use unsigned for iv computation

[Michael Niedermayer]

On Wed, Feb 09, 2022 at 01:55:31PM +0800, Steven Liu wrote:
> Michael Niedermayer <michael at niedermayer.cc> 于2022年2月8日周二 22:59写道：
> >
> > Fixes: signed integer overflow: 9223372036854775748 + 60 cannot be represented in type 'long'
> > Fixes: 44417/clusterfuzz-testcase-minimized-ffmpeg_dem_HLS_fuzzer-5802443881971712
> >
> > Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> > ---
> >  libavformat/hls.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/libavformat/hls.c b/libavformat/hls.c
> > index 4568e72cb2..8541fa9420 100644
> > --- a/libavformat/hls.c
> > +++ b/libavformat/hls.c
> > @@ -914,7 +914,7 @@ static int parse_playlist(HLSContext *c, const char *url,
> >                  if (has_iv) {
> >                      memcpy(seg->iv, iv, sizeof(iv));
> >                  } else {
> > -                    int64_t seq = pls->start_seq_no + pls->n_segments;
> > +                    uint64_t seq = pls->start_seq_no + (uint64_t)pls->n_segments;
> >                      memset(seg->iv, 0, sizeof(seg->iv));
> >                      AV_WB64(seg->iv + 8, seq);
> >                  }
> > --
> > 2.17.1
> >
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> >
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> 
> LGTM
> not sure int limit number is ok for n_segments, but i have no better
> idea for that.
> uint64_t here is ok.

will apply

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Why not whip the teacher when the pupil misbehaves? -- Diogenes of Sinope
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