ovl: add NULL check in ovl_alloc_inode

BugLink: http://bugs.launchpad.net/bugs/1731961
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>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index a3c4eb78946cb79724610deeebbce0886dc02863..d9bc32d2e6bb25e777f9ded189ee6d1147ebb19c 100644 (file)
--- 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;