lavfi: check all ff_start_frame/draw_slice/end_frame calls for errors

1 files changed, 14 insertions, 4 deletions

diff --git a/libavfilter/vf_frei0r.c b/libavfilter/vf_frei0r.c
index 4721779348..f5e9128d31 100644
--- a/libavfilter/vf_frei0r.c
+++ b/libavfilter/vf_frei0r.c
@@ -438,18 +438,28 @@ static int source_request_frame(AVFilterLink *outlink)
 {
     Frei0rContext *frei0r = outlink->src->priv;
     AVFilterBufferRef *picref = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+    int ret;
+
     picref->video->pixel_aspect = (AVRational) {1, 1};
     picref->pts = frei0r->pts++;
     picref->pos = -1;
 
-    ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
+    ret = ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
+    if (ret < 0)
+        goto fail;
+
     frei0r->update(frei0r->instance, av_rescale_q(picref->pts, frei0r->time_base, (AVRational){1,1000}),
                    NULL, (uint32_t *)picref->data[0]);
-    ff_draw_slice(outlink, 0, outlink->h, 1);
-    ff_end_frame(outlink);
+    ret = ff_draw_slice(outlink, 0, outlink->h, 1);
+    if (ret < 0)
+        goto fail;
+
+    ret = ff_end_frame(outlink);
+
+fail:
     avfilter_unref_buffer(picref);
 
-    return 0;
+    return ret;
 }
 
 AVFilter avfilter_vsrc_frei0r_src = {