From 88a96fa84186deadb8b1ecc8cb066cd7afeb5bf2 Mon Sep 17 00:00:00 2001
From: Juerg Haefliger <juerg.haefliger@canonical.com>
Date: Wed, 4 Oct 2017 04:24:41 -0400
Subject: [PATCH] jfs: Add missing NULL pointer check in __get_metapage

alloc_metapage can return a NULL pointer so check for that.

Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
---
 fs/jfs/jfs_metapage.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 1c4b9ad4d7ab..1a3b0cc22ad3 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -663,6 +663,8 @@ struct metapage *__get_metapage(struct inode *inode, unsigned long lblock,
 	} else {
 		INCREMENT(mpStat.pagealloc);
 		mp = alloc_metapage(GFP_NOFS);
+		if (!mp)
+			goto unlock;
 		mp->page = page;
 		mp->sb = inode->i_sb;
 		mp->flag = 0;