font: Assign null_font to unknown_glyph

Like glyphs in ascii_font_glyph[], assign null_font to
unknown_glyph->font in order to prevent grub_font_get_*() from
dereferencing NULL pointer.

Signed-off-by: Zhang Boyang <zhangboyang.id@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/font/font.c b/grub-core/font/font.c
index 19a47f873c5dcf55570c1be21fac07f5175f8259..674043d0d186b592bf1df7e30f4c292853e1389f 100644 (file)
--- a/grub-core/font/font.c
+++ b/grub-core/font/font.c
@@ -177,6 +177,7 @@ grub_font_loader_init (void)
   unknown_glyph->offset_x = 0;
   unknown_glyph->offset_y = -3;
   unknown_glyph->device_width = 8;
+  unknown_glyph->font = &null_font;
   grub_memcpy (unknown_glyph->bitmap,
               unknown_glyph_bitmap, sizeof (unknown_glyph_bitmap));