From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Zhang Boyang Date: Fri, 28 Oct 2022 17:29:16 +0800 Subject: [PATCH] font: Assign null_font to glyphs in ascii_font_glyph[] The calculations in blit_comb() need information from glyph's font, e.g. grub_font_get_xheight(main_glyph->font). However, main_glyph->font is NULL if main_glyph comes from ascii_font_glyph[]. Therefore grub_font_get_*() crashes because of NULL pointer. There is already a solution, the null_font. So, assign it to those glyphs in ascii_font_glyph[]. Reported-by: Daniel Axtens Signed-off-by: Zhang Boyang Reviewed-by: Daniel Kiper (cherry picked from commit dd539d695482069d28b40f2d3821f710cdcf6ee6) (cherry picked from commit 87526376857eaceae474c9797e3cee5b50597332) --- grub-core/font/font.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/grub-core/font/font.c b/grub-core/font/font.c index 29fbb94294..e6616e610c 100644 --- a/grub-core/font/font.c +++ b/grub-core/font/font.c @@ -137,7 +137,7 @@ ascii_glyph_lookup (grub_uint32_t code) ascii_font_glyph[current]->offset_x = 0; ascii_font_glyph[current]->offset_y = -2; ascii_font_glyph[current]->device_width = 8; - ascii_font_glyph[current]->font = NULL; + ascii_font_glyph[current]->font = &null_font; grub_memcpy (ascii_font_glyph[current]->bitmap, &ascii_bitmaps[current * ASCII_BITMAP_SIZE],