There is a problem in ascii_glyph_lookup(). It doesn't check the return
value of grub_malloc(). If memory can't be allocated, then NULL pointer
will be written to.
This patch fixes the problem by fallbacking to unknown_glyph in case of
grub_malloc() returns NULL.
Signed-off-by: Zhang Boyang <zhangboyang...@gmail.com>
---
grub-core/font/font.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/grub-core/font/font.c b/grub-core/font/font.c
index 3821937e6..19a47f873 100644
--- a/grub-core/font/font.c
+++ b/grub-core/font/font.c
@@ -131,6 +131,11 @@ ascii_glyph_lookup (grub_uint32_t code)
{
ascii_font_glyph[current] =
grub_malloc (sizeof (struct grub_font_glyph) + ASCII_BITMAP_SIZE);
+ if (ascii_font_glyph[current] == NULL)
+ {
+ ascii_font_glyph[current] = unknown_glyph;
+ continue;
+ }
ascii_font_glyph[current]->width = 8;
ascii_font_glyph[current]->height = 16;
--
2.30.2
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