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avcodec/dxv: Check op_offset in both directions

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Fixes: signed integer overflow: 61 + 2147483647 cannot be represented in type 'int'
Fixes: 15311/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXV_fuzzer-5742552826773504

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 8c7d5fcfc32d65951039ab2bb78947a41bdd96c4)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-27 00:29:06 +02:00
parent 59f5d232dc
commit cc4cdecc61
1 changed files with 1 additions and 1 deletions
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2
libavcodec/dxv.c
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@ -743,7 +743,7 @@ static int dxv_decompress_cocg(DXVContext *ctx, GetByteContext *gb,
int skip0, skip1, oi0 = 0, oi1 = 0;
int ret, state0 = 0, state1 = 0;
if (op_offset < 12)
if (op_offset < 12 || op_offset - 12 > bytestream2_get_bytes_left(gb))
return AVERROR_INVALIDDATA;
dst = tex_data;