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