userfaultfd: add vm_userfaultfd_ctx to the vm_area_struct

[firefly-linux-kernel-4.4.55.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 03aa2e6de7a4e90696c003792641d2c3a150cd02..ceb4eb4abb9df57d47abf60933fff346847de1b4 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -456,6 +456,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                        goto fail_nomem_anon_vma_fork;
                tmp->vm_flags &= ~VM_LOCKED;
                tmp->vm_next = tmp->vm_prev = NULL;
+               tmp->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
                file = tmp->vm_file;
                if (file) {
                        struct inode *inode = file_inode(file);