1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 1b119d3bf924..c4cd1fd86cc2 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -566,6 +566,13 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
         s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
         s->s_blocksize = path.dentry->d_sb->s_blocksize;
         s->s_magic = ECRYPTFS_SUPER_MAGIC;
+        s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
+
+        rc = -EINVAL;
+        if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
+                pr_err("eCryptfs: maximum fs stacking depth exceeded\n");
+                goto out_free;
+        }
 
         inode = ecryptfs_get_inode(path.dentry->d_inode, s);
         rc = PTR_ERR(inode);