avfilter/asubprocess: free memory in uninit()

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

libavfilter/af_asubprocess.c

@@ -87,6 +87,17 @@ static SPB *spb_new(AVFilterContext *ctx)
     return spb;
 }
 
+static void spb_free_all(SPB **spbp)
+{
+    SPB *spb = *spbp;
+    while (spb) {
+        SPB *to_free = spb;
+        spb = spb->next;
+        av_free(to_free);
+    }
+    *spbp = NULL;
+}
+
 static int
 sp_new(AVFilterContext *ctx)
 {
@@ -399,6 +410,11 @@ static av_cold void uninit(AVFilterContext *ctx)
 {
     ASubProcessContext *s = ctx->priv;
 
+    if (s->sp) {
+        spb_free_all(&s->sp->unused_buffers);
+        spb_free_all(&s->sp->out_buffers);
+        av_freep(&s->sp);
+    }
     ff_framequeue_free(&s->frame_queue);
     av_freep(&s->sample_buffer);
 }