diff options
Diffstat (limited to 'arch/arm/lib/uaccess_with_memcpy.c')
| -rw-r--r-- | arch/arm/lib/uaccess_with_memcpy.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/lib/uaccess_with_memcpy.c b/arch/arm/lib/uaccess_with_memcpy.c index c9450982a155..d72b14c96670 100644 --- a/arch/arm/lib/uaccess_with_memcpy.c +++ b/arch/arm/lib/uaccess_with_memcpy.c @@ -24,6 +24,7 @@ pin_page_for_write(const void __user *_addr, pte_t **ptep, spinlock_t **ptlp) { unsigned long addr = (unsigned long)_addr; pgd_t *pgd; + p4d_t *p4d; pmd_t *pmd; pte_t *pte; pud_t *pud; @@ -33,7 +34,11 @@ pin_page_for_write(const void __user *_addr, pte_t **ptep, spinlock_t **ptlp) if (unlikely(pgd_none(*pgd) || pgd_bad(*pgd))) return 0; - pud = pud_offset(pgd, addr); + p4d = p4d_offset(pgd, addr); + if (unlikely(p4d_none(*p4d) || p4d_bad(*p4d))) + return 0; + + pud = pud_offset(p4d, addr); if (unlikely(pud_none(*pud) || pud_bad(*pud))) return 0; |