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

1 files changed, 5 insertions, 3 deletions

diff --git a/libavfilter/vsrc_testsrc.c b/libavfilter/vsrc_testsrc.c
index 6de16768e8..22528b4650 100644
--- a/libavfilter/vsrc_testsrc.c
+++ b/libavfilter/vsrc_testsrc.c
@@ -130,6 +130,7 @@ static int request_frame(AVFilterLink *outlink)
 {
     TestSourceContext *test = outlink->src->priv;
     AVFilterBufferRef *picref;
+    int ret;
 
     if (test->max_pts >= 0 && test->pts > test->max_pts)
         return AVERROR_EOF;
@@ -143,9 +144,10 @@ static int request_frame(AVFilterLink *outlink)
     test->nb_frame++;
     test->fill_picture_fn(outlink->src, picref);
 
-    ff_start_frame(outlink, picref);
-    ff_draw_slice(outlink, 0, test->h, 1);
-    ff_end_frame(outlink);
+    if ((ret = ff_start_frame(outlink, picref)) < 0 ||
+        (ret = ff_draw_slice(outlink, 0, test->h, 1)) < 0 ||
+        (ret = ff_end_frame(outlink)) < 0)
+        return ret;
 
     return 0;
 }