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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Kiper <daniel.kiper@oracle.com>
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Date: Tue, 7 Jul 2020 15:36:26 +0200
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Subject: [PATCH] font: Do not load more than one NAME section
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The GRUB font file can have one NAME section only. Though if somebody
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crafts a broken font file with many NAME sections and loads it then the
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GRUB leaks memory. So, prevent against that by loading first NAME
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section and failing in controlled way on following one.
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Reported-by: Chris Coulson <chris.coulson@canonical.com>
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Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
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Reviewed-by: Jan Setje-Eilers <jan.setjeeilers@oracle.com>
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Upstream-commit-id: 482814113dc
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---
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grub-core/font/font.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/grub-core/font/font.c b/grub-core/font/font.c
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index d63354fb51b..a7b955a1a74 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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@@ -532,6 +532,12 @@ grub_font_load (const char *filename)
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if (grub_memcmp (section.name, FONT_FORMAT_SECTION_NAMES_FONT_NAME,
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sizeof (FONT_FORMAT_SECTION_NAMES_FONT_NAME) - 1) == 0)
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{
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+ if (font->name != NULL)
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+ {
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+ grub_error (GRUB_ERR_BAD_FONT, "invalid font file: too many NAME sections");
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+ goto fail;
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+ }
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+
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font->name = read_section_as_string (§ion);
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if (!font->name)
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goto fail;
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