ext4: fix hang when processing corrupted orphaned inode list

[firefly-linux-kernel-4.4.55.git] / fs / userfaultfd.c

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 50311703135bc8c699bcc3d26d0b9aa24b5277f3..66cdb44616d5a0ba79a04f60de5fd835805b6e56 100644 (file)
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -286,6 +286,12 @@ int handle_userfault(struct vm_area_struct *vma, unsigned long address,
        if (unlikely(ACCESS_ONCE(ctx->released)))
                goto out;
 
+       /*
+        * We don't do userfault handling for the final child pid update.
+        */
+       if (current->flags & PF_EXITING)
+               goto out;
+
        /*
         * Check that we can return VM_FAULT_RETRY.
         *