avfilter/af_join: do not dereference possible null pointer

3 years ago · 55e509b094
parent f9db470f25
commit 55e509b094
1 changed files with 2 additions and 1 deletions
--- a/libavfilter/af_join.c
+++ b/libavfilter/af_join.c
@ -586,7 +586,8 @@ static int activate(AVFilterContext *ctx)
        }
    }

-    nb_samples = s->input_frames[0]->nb_samples;
+    if (s->input_frames[0])
+        nb_samples = s->input_frames[0]->nb_samples;

    for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) {
        if (s->input_frames[i])