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-rw-r--r--src/fontcache.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/fontcache.cpp b/src/fontcache.cpp
index b279c3463..616c54a9e 100644
--- a/src/fontcache.cpp
+++ b/src/fontcache.cpp
@@ -1034,6 +1034,9 @@ const Sprite *GetGlyph(FontSize size, WChar key)
width = max(1, slot->bitmap.width + (size == FS_NORMAL));
height = max(1, slot->bitmap.rows + (size == FS_NORMAL));
+ /* Limit glyph size to prevent overflows later on. */
+ if (width > 256 || height > 256) usererror("Font glyph is too large");
+
/* FreeType has rendered the glyph, now we allocate a sprite and copy the image into it */
sprite.AllocateData(width * height);
sprite.width = width;