[sbix] Limit glyph extents

Fixes #3557
harfbuzz · Jun 1, 2022 · 62e803b · 62e803b
1 parent cd05d18
commit 62e803b
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diff --git a/src/hb-ot-color-sbix-table.hh b/src/hb-ot-color-sbix-table.hh
@@ -298,6 +298,12 @@ struct sbix
 
       const PNGHeader &png = *blob->as<PNGHeader>();
 
+      if (png.IHDR.height >= 65536 | png.IHDR.width >= 65536)
+      {
+	hb_blob_destroy (blob);
+	return false;
+      }
+
       extents->x_bearing = x_offset;
       extents->y_bearing = png.IHDR.height + y_offset;
       extents->width     = png.IHDR.width;

diff --git a/test/fuzzing/fonts/sbix-extents.ttf b/test/fuzzing/fonts/sbix-extents.ttf