@@ -402,6 +402,10 @@ static av_cold void uninit(AVFilterContext *ctx)

     DrawTextContext *s = ctx->priv;

     int i;

+    av_expr_free(s->x_pexpr);

+    av_expr_free(s->y_pexpr);

+    av_expr_free(s->d_pexpr);

+    s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;

     av_freep(&s->expanded_text);

     av_freep(&s->positions);

     av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);

@@ -573,6 +577,10 @@ static int config_input(AVFilterLink *inlink)

     av_lfg_init(&s->prng, av_get_random_seed());

+    av_expr_free(s->x_pexpr);

+    av_expr_free(s->y_pexpr);

+    av_expr_free(s->d_pexpr);

+    s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;

     if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,

                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||

         (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,