hugetlb: fix race condition in hugetlb_fault()

[linux-flexiantxendom0.git] / mm / hugetlb.c

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2316840..bd936ed 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2686,6 +2686,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
         * so no worry about deadlock.
         */
        page = pte_page(entry);
+       get_page(page);
        if (page != pagecache_page)
                lock_page(page);
 
@@ -2717,6 +2718,7 @@ out_page_table_lock:
        }
        if (page != pagecache_page)
                unlock_page(page);
+       put_page(page);
 
 out_mutex:
        mutex_unlock(&hugetlb_instantiation_mutex);