From 65f5033702780ce355749b09644df57c5305db33 Mon Sep 17 00:00:00 2001
From: Giovanni Mascellani <gmascellani@codeweavers.com>
Date: Wed, 3 Mar 2021 15:25:28 +0100
Subject: [PATCH] dwrite: Do not segfault when there are no typographic
 features to return.

Signed-off-by: Giovanni Mascellani <gmascellani@codeweavers.com>
Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/dwrite/shape.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dlls/dwrite/shape.c b/dlls/dwrite/shape.c
index 6428bf6ceb0..abeb7eeac79 100644
--- a/dlls/dwrite/shape.c
+++ b/dlls/dwrite/shape.c
@@ -372,6 +372,12 @@ HRESULT shape_get_typographic_features(struct scriptshaping_context *context, co
     shape_get_script_lang_index(context, scripts, MS_GPOS_TAG, &script_index, &language_index);
     opentype_get_typographic_features(&context->cache->gpos, script_index, language_index, &t);
 
+    if (t.count == 0)
+    {
+        *actual_tagcount = 0;
+        return S_OK;
+    }
+
     /* Sort and remove duplicates. */
     qsort(t.tags, t.count, sizeof(*t.tags), tag_array_sorting_compare);