From: Hirofumi Nakagawa <nklabs@gmail.com>
Date: Mon, 25 Sep 2017 18:09:53 +0000 (+0900)
Subject: ovl: add NULL check in ovl_alloc_inode
X-Git-Tag: v4.13.11~28
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d22011059462aa003e5825a8180f12db9a980e0c;p=thirdparty%2Fkernel%2Fstable.git

ovl: add NULL check in ovl_alloc_inode

commit b3885bd6edb41b91a0e3976469f72ae31bfb8d95 upstream.

This was detected by fault injection test

Signed-off-by: Hirofumi Nakagawa <nklabs@gmail.com>
Fixes: 13cf199d0088 ("ovl: allocate an ovl_inode struct")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index a1464905c1eaa..e2192e1eb564c 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -174,6 +174,9 @@ static struct inode *ovl_alloc_inode(struct super_block *sb)
 {
 	struct ovl_inode *oi = kmem_cache_alloc(ovl_inode_cachep, GFP_KERNEL);
 
+	if (!oi)
+		return NULL;
+
 	oi->cache = NULL;
 	oi->redirect = NULL;
 	oi->version = 0;