diff options
Diffstat (limited to 'arch/x86/mm/pgtable_32.c')
| -rw-r--r-- | arch/x86/mm/pgtable_32.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c index de53c52551a5..b9bd5b8b14fa 100644 --- a/arch/x86/mm/pgtable_32.c +++ b/arch/x86/mm/pgtable_32.c @@ -26,6 +26,7 @@ unsigned int __VMALLOC_RESERVE = 128 << 20; void set_pte_vaddr(unsigned long vaddr, pte_t pteval) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -35,7 +36,12 @@ void set_pte_vaddr(unsigned long vaddr, pte_t pteval) BUG(); return; } - pud = pud_offset(pgd, vaddr); + p4d = p4d_offset(pgd, vaddr); + if (p4d_none(*p4d)) { + BUG(); + return; + } + pud = pud_offset(p4d, vaddr); if (pud_none(*pud)) { BUG(); return; |