[PATCH] dwrite: Avoid possible out-of-bounds cluster metrics access.

[Nikolay Sivov]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45535
Signed-off-by: Nikolay Sivov <nsivov(a)codeweavers.com>
---
 dlls/dwrite/layout.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/dwrite/layout.c b/dlls/dwrite/layout.c
index 65e0a57678..10d591457c 100644
--- a/dlls/dwrite/layout.c
+++ b/dlls/dwrite/layout.c
@@ -2089,7 +2089,7 @@ static HRESULT layout_compute_effective_runs(struct dwrite_textlayout *layout)
     */
     if (layout->len == 0)
         hr = layout_set_dummy_line_metrics(layout, 0);
-    else if (layout->clustermetrics[layout->cluster_count - 1].isNewline)
+    else if (layout->cluster_count && layout->clustermetrics[layout->cluster_count - 1].isNewline)
         hr = layout_set_dummy_line_metrics(layout, layout->len - 1);
     if (FAILED(hr))
         return hr;
-- 
2.18.0