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avcodec/aom_film_grain: avoid duplicate indexes in ff_aom_parse_film_grain_sets()

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Fixes: use after free
Fixes: 478301106/clusterfuzz-testcase-minimized-ffmpeg_dem_HEVC_fuzzer-6155792247226368

Found-by:  continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ebb6ac1bc7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2026-02-06 03:27:20 +01:00
parent ed9d8dd74b
commit 9909d4e88c
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1 changed files with 2 additions and 1 deletions
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3
libavcodec/aom_film_grain.c
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@ -152,8 +152,9 @@ int ff_aom_parse_film_grain_sets(AVFilmGrainAFGS1Params *s,
payload_4byte = get_bits1(gb);
payload_size = get_bits(gb, payload_4byte ? 2 : 8);
set_idx = get_bits(gb, 3);
fgp = av_film_grain_params_alloc(&fgp_size);
if (!fgp)
if (!fgp || s->sets[set_idx])
goto error;
aom = &fgp->codec.aom;