diff --git a/libavfilter/vf_hqdn3d.c b/libavfilter/vf_hqdn3d.c
index c0145647b5..fd41aab022 100644
--- a/libavfilter/vf_hqdn3d.c
+++ b/libavfilter/vf_hqdn3d.c
@@ -252,6 +252,8 @@ static int config_input(AVFilterLink *inlink)
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     int i;
 
+    uninit(inlink->dst);
+
     s->hsub  = desc->log2_chroma_w;
     s->vsub  = desc->log2_chroma_h;
     s->depth = desc->comp[0].depth_minus1+1;
diff --git a/libavfilter/vf_pixdesctest.c b/libavfilter/vf_pixdesctest.c
index 7fd2c78f63..55e6e39638 100644
--- a/libavfilter/vf_pixdesctest.c
+++ b/libavfilter/vf_pixdesctest.c
@@ -46,6 +46,7 @@ static int config_props(AVFilterLink *inlink)
 
     priv->pix_desc = av_pix_fmt_desc_get(inlink->format);
 
+    av_freep(&priv->line);
     if (!(priv->line = av_malloc(sizeof(*priv->line) * inlink->w)))
         return AVERROR(ENOMEM);