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hevc: use av_mallocz() for allocating tab_ipm
Fixes use of uninitialized memory and out of stack array read. Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
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@ -212,7 +212,7 @@ static int pic_arrays_init(HEVCContext *s, const HEVCSPS *sps)
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goto fail;
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s->cbf_luma = av_malloc(sps->min_tb_width * sps->min_tb_height);
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s->tab_ipm = av_malloc(min_pu_size);
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s->tab_ipm = av_mallocz(min_pu_size);
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s->is_pcm = av_malloc(min_pu_size);
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if (!s->tab_ipm || !s->cbf_luma || !s->is_pcm)
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goto fail;
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