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avcodec/dxv: Check op_offset in dxv_decompress_cocg()

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Fixes: signed integer overflow: -2147483648 - 12 cannot be represented in type 'int'
Fixes: 14732/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXV_fuzzer-5735273129836544

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 8e520843dd76a644c019134ac7b17eba9f1118b3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-05-21 01:33:03 +02:00
parent da7dd17401
commit 08c9711d91
1 changed files with 3 additions and 0 deletions
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3
libavcodec/dxv.c
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@ -743,6 +743,9 @@ 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)
return AVERROR_INVALIDDATA;
dst = tex_data;
bytestream2_skip(gb, op_offset - 12);
if (op_size0 > max_op_size0)