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mm: Avoid integer overflow.

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This commit is contained in:
Vladimir Serbinenko 2016-02-17 18:09:44 +01:00
parent fabde8324d
commit 59ec05bcf8
1 changed files with 9 additions and 0 deletions
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9
grub-core/kern/mm.c
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@ -325,6 +325,15 @@ grub_memalign (grub_size_t align, grub_size_t size)
if (!grub_mm_base) if (!grub_mm_base)
goto fail; goto fail;
if (size > ~(grub_size_t) align)
goto fail;
/* We currently assume at least a 32-bit grub_size_t,
so limiting allocations to <adress space size> - 1MiB
in name of sanity is beneficial. */
if ((size + align) > ~(grub_size_t) 0x100000)
goto fail;
align = (align >> GRUB_MM_ALIGN_LOG2); align = (align >> GRUB_MM_ALIGN_LOG2);
if (align == 0) if (align == 0)
align = 1; align = 1;