https://bugs.gentoo.org/939607
https://gitlab.freedesktop.org/cairo/cairo/-/issues/870
https://gitlab.freedesktop.org/cairo/cairo/-/merge_requests/595
https://gitlab.freedesktop.org/cairo/cairo/-/commit/f19e2fe080ddcfce93c8234a919fd882f3d63362

From f19e2fe080ddcfce93c8234a919fd882f3d63362 Mon Sep 17 00:00:00 2001
From: Adrian Johnson <ajohnson@redneon.com>
Date: Fri, 13 Sep 2024 06:28:39 +0930
Subject: [PATCH] cff: Don't fail if no local subs

Fixes: #870
--- a/src/cairo-cff-subset.c
+++ b/src/cairo-cff-subset.c
@@ -952,9 +952,13 @@ cairo_cff_font_read_private_dict (cairo_cff_font_t   *font,
 	 decode_number (operand, nominal_width);
 
     num_subs = _cairo_array_num_elements (local_sub_index);
-    *local_subs_used = _cairo_calloc_ab (num_subs, sizeof (cairo_bool_t));
-    if (unlikely (*local_subs_used == NULL))
-	return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+    if (num_subs > 0) {
+	*local_subs_used = _cairo_calloc_ab (num_subs, sizeof (cairo_bool_t));
+	if (unlikely (*local_subs_used == NULL))
+	    return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+    } else {
+	*local_subs_used = NULL;
+    }
 
     if (num_subs < 1240)
 	*local_sub_bias = 107;
-- 
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