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avcodec/h274: fix bad left shifts

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Fixes: left shift of negative value -3
Fixes: 37788/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-6024714540154880

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-09-14 20:23:52 +02:00
parent 5f835efbca
commit 991b3deea9
1 changed files with 2 additions and 2 deletions
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4
libavcodec/h274.c
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@ -250,8 +250,8 @@ int ff_h274_apply_film_grain(AVFrame *out_frame, const AVFrame *in_frame,
// Adaptation for 4:2:0 chroma subsampling
for (int i = 0; i < h274.num_intensity_intervals[c]; i++) {
h274.comp_model_value[c][i][0] >>= 1;
h274.comp_model_value[c][i][1] <<= 1;
h274.comp_model_value[c][i][2] <<= 1;
h274.comp_model_value[c][i][1] *= 2;
h274.comp_model_value[c][i][2] *= 2;
}
}