diff options
Diffstat (limited to 'arch/um/kernel/skas/uaccess.c')
| -rw-r--r-- | arch/um/kernel/skas/uaccess.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c index 3236052f20e6..d617f8dc9c19 100644 --- a/arch/um/kernel/skas/uaccess.c +++ b/arch/um/kernel/skas/uaccess.c @@ -17,6 +17,7 @@ pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; @@ -27,7 +28,11 @@ pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr) if (!pgd_present(*pgd)) return NULL; - pud = pud_offset(pgd, addr); + p4d = p4d_offset(pgd, addr); + if (!p4d_present(*p4d)) + return NULL; + + pud = pud_offset(p4d, addr); if (!pud_present(*pud)) return NULL; |