avfilter/vf_random: fix crash

Fixes #8235.

diff --git a/libavfilter/vf_random.c b/libavfilter/vf_random.c
index 373a7db053af1220b4218828a2e7ddf1003cc569..1937eae77169c59d88689239a578afe934220d87 100644 (file)
--- a/libavfilter/vf_random.c
+++ b/libavfilter/vf_random.c
@@ -97,8 +97,13 @@ static int request_frame(AVFilterLink *outlink)
 
     ret = ff_request_frame(ctx->inputs[0]);
 
+next:
     if (ret == AVERROR_EOF && !ctx->is_disabled && s->nb_frames > 0) {
         AVFrame *out = s->frames[s->nb_frames - 1];
+        if (!out) {
+            s->nb_frames--;
+            goto next;
+        }
         out->pts = s->pts[s->flush_idx++];
         ret = ff_filter_frame(outlink, out);
         s->frames[s->nb_frames - 1] = NULL;