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avcodec/g2meet: Check for end of input in jpg_decode_block()

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Fixes: Timeout (100sec -> 0.7sec)
Fixes: 8668/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G2M_fuzzer-5174143888130048

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 61dd2e07be)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-09 20:30:32 +02:00
parent a547d59079
commit c8823d4957
1 changed files with 3 additions and 0 deletions
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3
libavcodec/g2meet.c
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@ -244,6 +244,9 @@ static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
const int is_chroma = !!plane;
const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
c->bdsp.clear_block(block);
dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
if (dc < 0)