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avcodec/hevcdsp_template: stay within tables in sao_band_filter()

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Fixes: out of array read
Fixes: 47875/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5719393113341952

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 9c5250a561)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2022-06-09 22:21:55 +02:00
parent 5bf38f660c
commit c03f09f6f4
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1 changed files with 1 additions and 1 deletions
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libavcodec/hevcdsp_template.c
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@ -313,7 +313,7 @@ static void FUNC(sao_band_filter)(uint8_t *_dst, uint8_t *_src,
offset_table[(k + sao_left_class) & 31] = sao_offset_val[k + 1]; offset_table[(k + sao_left_class) & 31] = sao_offset_val[k + 1];
for (y = 0; y < height; y++) { for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) for (x = 0; x < width; x++)
dst[x] = av_clip_pixel(src[x] + offset_table[src[x] >> shift]); dst[x] = av_clip_pixel(src[x] + offset_table[(src[x] >> shift) & 31]);
dst += stride_dst; dst += stride_dst;
src += stride_src; src += stride_src;
} }