avfilter/vf_colorconstancy: av_frame_free(&in) in case of error or direct flag is false

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavfilter/vf_colorconstancy.c

@@ -682,13 +682,16 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     AVFilterLink *outlink = ctx->outputs[0];
     AVFrame *out;
     int ret;
+    int direct = 0;
 
     ret = illumination_estimation(ctx, in);
     if (ret) {
+        av_frame_free(&in);
         return ret;
     }
 
     if (av_frame_is_writable(in)) {
+        direct = 1;
         out = in;
     } else {
         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
@@ -700,6 +703,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     }
     chromatic_adaptation(ctx, in, out);
 
+    if (!direct)
+        av_frame_free(&in);
+
     return ff_filter_frame(outlink, out);
 }