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avcodec/diracdec: Fix off by 1 error in quant check 

Fixes: out of array read
Fixes: 1781/clusterfuzz-testcase-minimized-4617176877105152

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 2017-05-25 16:35:40 +02:00
parent 6d6fc4105b
commit b946bd8ef2
1 changed files with 1 additions and 1 deletions
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2
libavcodec/diracdec.c
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@ -823,7 +823,7 @@ static int decode_hq_slice(DiracContext *s, DiracSlice *slice, uint8_t *tmp_buf)
skip_bits_long(gb, 8*s->highquality.prefix_bytes);
quant_idx = get_bits(gb, 8);
if (quant_idx > DIRAC_MAX_QUANT_INDEX) {
if (quant_idx > DIRAC_MAX_QUANT_INDEX - 1) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid quantization index - %i\n", quant_idx);
return AVERROR_INVALIDDATA;
}