X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;ds=sidebyside;f=fs%2Fuserfaultfd.c;h=66cdb44616d5a0ba79a04f60de5fd835805b6e56;hb=36e6321056ba24f004bfc16d4398e65a6651f843;hp=50311703135bc8c699bcc3d26d0b9aa24b5277f3;hpb=dc5bc3f1e3d886ce1193281bb2bfb2b44f4aeae4;p=firefly-linux-kernel-4.4.55.git

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 50311703135b..66cdb44616d5 100644
--- 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.
 	 *