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avcodec/ffv1dec: Fix off by 1 error with quant tables 

Fixes: assertion failure
Fixes: 28447/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-5369575948550144

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-12-19 00:22:04 +01:00
parent c0e660ba14
commit 5cae71d2b7
1 changed files with 1 additions and 1 deletions
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2
libavcodec/ffv1dec.c
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@ -786,7 +786,7 @@ static int read_header(FFV1Context *f)
if (f->version == 2) {
int idx = get_symbol(c, state, 0);
if (idx > (unsigned)f->quant_table_count) {
if (idx >= (unsigned)f->quant_table_count) {
av_log(f->avctx, AV_LOG_ERROR,
"quant_table_index out of range\n");
return AVERROR_INVALIDDATA;