From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Zhang Boyang Date: Wed, 3 Aug 2022 19:45:33 +0800 Subject: [PATCH] font: Reject glyphs exceeds font->max_glyph_width or font->max_glyph_height 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 Reviewed-by: Daniel Kiper (cherry picked from commit 5760fcfd466cc757540ea0d591bad6a08caeaa16) (cherry picked from commit 3b410ef4bb95e607cadeba2193fa90ae9bddb98d) --- grub-core/font/font.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/grub-core/font/font.c b/grub-core/font/font.c index d09bb38d89..2f09a4a55b 100644 --- a/grub-core/font/font.c +++ b/grub-core/font/font.c @@ -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;