mm/mempolicy.c: check return code of check_range

Function check_range may return ERR_PTR(...). Check for it.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 21243b2b7b07..81a127643aea 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -924,12 +924,15 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
         nodemask_t nmask;
         LIST_HEAD(pagelist);
         int err = 0;
+        struct vm_area_struct *vma;
 
         nodes_clear(nmask);
         node_set(source, nmask);
 
-        check_range(mm, mm->mmap->vm_start, mm->task_size, &nmask,
+        vma = check_range(mm, mm->mmap->vm_start, mm->task_size, &nmask,
                         flags | MPOL_MF_DISCONTIG_OK, &pagelist);
+        if (IS_ERR(vma))
+                return PTR_ERR(vma);
 
         if (!list_empty(&pagelist)) {
                 err = migrate_pages(&pagelist, new_node_page, dest, 0);