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

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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>
(cherry picked from commit 5cae71d2b7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2020-12-19 00:22:04 +01:00
parent 92c1ee9486
commit dcb07bee75
1 changed files with 1 additions and 1 deletions
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2
libavcodec/ffv1dec.c
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@@ -789,7 +789,7 @@ static int read_header(FFV1Context *f)
if (f->version == 2) { if (f->version == 2) {
int idx = get_symbol(c, state, 0); 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, av_log(f->avctx, AV_LOG_ERROR,
"quant_table_index out of range\n"); "quant_table_index out of range\n");
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;