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vcodec/vc1: compute rangex/y only for P/B frames 

Fixes: left shift of 1073741824 by 1 places cannot be represented in type 'int'
Fixes: 16976/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-4847262047404032

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-10 20:20:31 +02:00
parent ced9a1cd0a
commit e75e7fe160
1 changed files with 5 additions and 4 deletions
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9
libavcodec/vc1.c
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@ -1319,16 +1319,17 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
break;
}
if (v->fcm != PROGRESSIVE && !v->s.quarter_sample) {
v->range_x <<= 1;
v->range_y <<= 1;
}
/* AC Syntax */
v->c_ac_table_index = decode012(gb);
if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI) {
v->y_ac_table_index = decode012(gb);
}
else if (v->fcm != PROGRESSIVE && !v->s.quarter_sample) {
v->range_x <<= 1;
v->range_y <<= 1;
}
/* DC Syntax */
v->s.dc_table_index = get_bits1(gb);
if ((v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI)