ovl: add NULL check in ovl_alloc_inode

This was detected by fault injection test

Signed-off-by: Hirofumi Nakagawa <nklabs@gmail.com>
Fixes: 13cf199d0088 ("ovl: allocate an ovl_inode struct")
Cc: <stable@vger.kernel.org> # v4.13

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 092d150..f5738e9 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;