From: Zhang Boyang Date: Fri, 28 Oct 2022 09:29:16 +0000 (+0800) Subject: font: Assign null_font to glyphs in ascii_font_glyph[] X-Git-Tag: grub-2.12-rc1~213 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=22b77b87e10a3a6c9bb9885415bc9a9c678378e6;p=thirdparty%2Fgrub.git 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 --- diff --git a/grub-core/font/font.c b/grub-core/font/font.c index cf15dc2f9..3821937e6 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],