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avcodec/msmpeg4dec: Check for cbpy VLC errors
Fixes: runtime error: left shift of negative value -1 Fixes: 1480/clusterfuzz-testcase-minimized-5188321007370240 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> (cherry picked from commit 15e892aad12b23e9b5686cf66ca6fa739c734ead) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -170,12 +170,23 @@ static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
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s->mv[0][0][1] = my;
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*mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
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} else {
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int v;
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if(s->msmpeg4_version==2){
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s->ac_pred = get_bits1(&s->gb);
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cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
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v = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
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if (v < 0) {
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av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
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return -1;
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}
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cbp|= v<<2;
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} else{
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s->ac_pred = 0;
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cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
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v = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
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if (v < 0) {
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av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
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return -1;
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}
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cbp|= v<<2;
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if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
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}
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*mb_type_ptr = MB_TYPE_INTRA;
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