vf_drawtext: fix segfault on reinit

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index 8615aefd1aea13f050ead38eeda5f2f479f0212d..4e65e612e11481f7c955388e654ef8b582bed111 100644 (file)
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -355,6 +355,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     av_freep(&dtext->fontcolor_string);
     av_freep(&dtext->boxcolor_string);
     av_freep(&dtext->positions);
+    dtext->nb_positions = 0;
     av_freep(&dtext->shadowcolor_string);
     av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
     av_tree_destroy(dtext->glyphs);