aboutsummaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c17
-rw-r--r--mm/migrate.c10
2 files changed, 23 insertions, 4 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 19e0ae9beec..9aefaae4685 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -999,17 +999,15 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
goto no_page_table;
ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
- if (!ptep)
- goto out;
pte = *ptep;
if (!pte_present(pte))
- goto unlock;
+ goto no_page;
if ((flags & FOLL_WRITE) && !pte_write(pte))
goto unlock;
page = vm_normal_page(vma, address, pte);
if (unlikely(!page))
- goto unlock;
+ goto bad_page;
if (flags & FOLL_GET)
get_page(page);
@@ -1024,6 +1022,15 @@ unlock:
out:
return page;
+bad_page:
+ pte_unmap_unlock(ptep, ptl);
+ return ERR_PTR(-EFAULT);
+
+no_page:
+ pte_unmap_unlock(ptep, ptl);
+ if (!pte_none(pte))
+ return page;
+ /* Fall through to ZERO_PAGE handling */
no_page_table:
/*
* When core dumping an enormous anonymous area that nobody
@@ -1159,6 +1166,8 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
cond_resched();
}
+ if (IS_ERR(page))
+ return i ? i : PTR_ERR(page);
if (pages) {
pages[i] = page;
diff --git a/mm/migrate.c b/mm/migrate.c
index 449d77d409f..112bcaeaa10 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -865,6 +865,11 @@ static int do_move_pages(struct mm_struct *mm, struct page_to_node *pm,
goto set_status;
page = follow_page(vma, pp->addr, FOLL_GET);
+
+ err = PTR_ERR(page);
+ if (IS_ERR(page))
+ goto set_status;
+
err = -ENOENT;
if (!page)
goto set_status;
@@ -928,6 +933,11 @@ static int do_pages_stat(struct mm_struct *mm, struct page_to_node *pm)
goto set_status;
page = follow_page(vma, pm->addr, 0);
+
+ err = PTR_ERR(page);
+ if (IS_ERR(page))
+ goto set_status;
+
err = -ENOENT;
/* Use PageReserved to check for zero page */
if (!page || PageReserved(page))