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diff --git a/gfx/cairo/cairo/src/cairo-ft-font.c b/gfx/cairo/cairo/src/cairo-ft-font.c
--- a/gfx/cairo/cairo/src/cairo-ft-font.c
+++ b/gfx/cairo/cairo/src/cairo-ft-font.c
@@ -63,6 +63,10 @@
 /* This is the max number of FT_face objects we keep open at once
  */
 #define MAX_OPEN_FACES 10
+
+/* This is the maximum font size we allow to be passed to FT_Set_Char_Size
+ */
+#define MAX_FONT_SIZE 1000
 
 /*
  * The simple 2x2 matrix is converted into separate scale and shape
@@ -682,9 +686,11 @@ _cairo_ft_unscaled_font_set_scale (cairo
     FT_Set_Transform(unscaled->face, &mat, NULL);
 
     if ((unscaled->face->face_flags & FT_FACE_FLAG_SCALABLE) != 0) {
+	double x_scale = MIN(sf.x_scale, MAX_FONT_SIZE);
+	double y_scale = MIN(sf.y_scale, MAX_FONT_SIZE);
 	error = FT_Set_Char_Size (unscaled->face,
-				  sf.x_scale * 64.0 + .5,
-				  sf.y_scale * 64.0 + .5,
+				  x_scale * 64.0 + .5,
+				  y_scale * 64.0 + .5,
 				  0, 0);
 	if (error)
 	    return _cairo_error (CAIRO_STATUS_NO_MEMORY);