static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
				  struct dentry *dentry, u32 mask)
{
	struct path path = { mnt, dentry };
	struct path_cond cond = { dentry->d_inode->i_uid,
				  dentry->d_inode->i_mode
	};

	return common_perm(op, &path, mask, &cond);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.