gfx/cairo/dwrite-font-match-robustness.patch

   1 From: Robert O'Callahan <robert@ocallahan.org>
   2 Bug 717178. Part 1: Don't crash when passing a nil scaled-font to _name_tables_match. r=jfkthame
   3
   4 diff --git a/gfx/cairo/cairo/src/cairo-dwrite-font.cpp b/gfx/cairo/cairo/src/cairo-dwrite-font.cpp
   5 --- a/gfx/cairo/cairo/src/cairo-dwrite-font.cpp
   6 +++ b/gfx/cairo/cairo/src/cairo-dwrite-font.cpp
   7 @@ -1489,17 +1489,18 @@ static cairo_bool_t
   8      unsigned long size1;
   9      unsigned long size2;
  10      cairo_int_status_t status1;
  11      cairo_int_status_t status2;
  12      unsigned char *buffer1;
  13      unsigned char *buffer2;
  14      cairo_bool_t result = false;
  15
  16 -    if (!font1->backend->load_truetype_table ||
  17 +    if (!font1->backend || !font2->backend ||
  18 +        !font1->backend->load_truetype_table ||
  19          !font2->backend->load_truetype_table)
  20          return false;
  21
  22      status1 = font1->backend->load_truetype_table (font1,
  23                                                     TT_TAG_name, 0, NULL, &size1);
  24      status2 = font2->backend->load_truetype_table (font2,
  25                                                     TT_TAG_name, 0, NULL, &size2);
  26      if (status1 || status2)