mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/mpegvideo_motion: Check P field references
If a reference is unavailable use a field from the current picture Fixes null pointer dereference Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -809,7 +809,8 @@ static av_always_inline void MPV_motion_internal(MpegEncContext *s,
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s->mv[dir][1][0], s->mv[dir][1][1], 8, mb_y);
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}
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} else {
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if(s->picture_structure != s->field_select[dir][0] + 1 && s->pict_type != AV_PICTURE_TYPE_B && !s->first_field){
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if( s->picture_structure != s->field_select[dir][0] + 1 && s->pict_type != AV_PICTURE_TYPE_B && !s->first_field
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|| !ref_picture[0]){
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ref_picture = s->current_picture_ptr->f.data;
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}
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