mirror of https://git.ffmpeg.org/ffmpeg.git
mpegvideo: set AVFrame fields to NULL after freeing the base memory
Prevents dangling pointers and makes access after free more obvious. Setting AVFrame.qscale_table to NULL is required for successfully allocating a previously freed Picture with ff_alloc_picture().
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@ -393,13 +393,16 @@ static void free_picture(MpegEncContext *s, Picture *pic)
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av_freep(&pic->mb_mean);
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av_freep(&pic->f.mbskip_table);
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av_freep(&pic->qscale_table_base);
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pic->f.qscale_table = NULL;
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av_freep(&pic->mb_type_base);
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pic->f.mb_type = NULL;
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av_freep(&pic->f.dct_coeff);
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av_freep(&pic->f.pan_scan);
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pic->f.mb_type = NULL;
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for (i = 0; i < 2; i++) {
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av_freep(&pic->motion_val_base[i]);
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av_freep(&pic->f.ref_index[i]);
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pic->f.motion_val[i] = NULL;
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}
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if (pic->f.type == FF_BUFFER_TYPE_SHARED) {
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