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font: Reject glyphs exceeds font->max_glyph_width or font->max_glyph_height

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Check glyph's width and height against limits specified in font's
metadata. Reject the glyph (and font) if such limits are exceeded.

Signed-off-by: Zhang Boyang <zhangboyang.id@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Zhang Boyang 2022-08-03 19:45:33 +08:00 committed by Daniel Kiper
parent 1131429391
commit f6b6236077
1 changed files with 3 additions and 1 deletions
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4
grub-core/font/font.c
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@ -760,7 +760,9 @@ grub_font_get_glyph_internal (grub_font_t font, grub_uint32_t code)
|| read_be_uint16 (font->file, &height) != 0
|| read_be_int16 (font->file, &xoff) != 0
|| read_be_int16 (font->file, &yoff) != 0
|| read_be_int16 (font->file, &dwidth) != 0)
|| read_be_int16 (font->file, &dwidth) != 0
|| width > font->max_char_width
|| height > font->max_char_height)
{
remove_font (font);
return 0;