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avcodec/cbs_jpeg_syntax_template: Check table index before use in dht()

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Fixes: out of array access
Fixes: 21515/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5766121576988672

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 2020-04-12 21:38:55 +02:00
parent 07ecc4615c
commit d31862c2b1
1 changed files with 3 additions and 0 deletions
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libavcodec/cbs_jpeg_syntax_template.c
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@ -108,6 +108,9 @@ static int FUNC(dht)(CodedBitstreamContext *ctx, RWContext *rw,
n = 2; n = 2;
for (i = 0; n < current->Lh; i++) { for (i = 0; n < current->Lh; i++) {
if (i >= 8)
return AVERROR_INVALIDDATA;
CHECK(FUNC(huffman_table)(ctx, rw, &current->table[i])); CHECK(FUNC(huffman_table)(ctx, rw, &current->table[i]));
++n; ++n;