From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 10 Mar 2018 16:40:33 -0500
Subject: [PATCH 14/17] oprofilefs: don't oops on allocation failure
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.16/older/patches-4.16.7-rt1.tar.xz

Upstream commit a7498968338da9b928f5d8054acc8be6ed2bc14c

... just short-circuit the creation of potential children

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/oprofile/oprofilefs.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/oprofile/oprofilefs.c
+++ b/drivers/oprofile/oprofilefs.c
@@ -138,6 +138,9 @@ static int __oprofilefs_create_file(stru
 	struct dentry *dentry;
 	struct inode *inode;
 
+	if (!root)
+		return -ENOMEM;
+
 	inode_lock(d_inode(root));
 	dentry = d_alloc_name(root, name);
 	if (!dentry) {