On Fri, Oct 21, 2016 at 02:48:35PM +0200, Richard Weinberger wrote:
> +
> + if (!dentry)
> + return ERR_PTR(-ECHILD);
> +
> + if (ubifs_crypt_is_encrypted(inode)) {
> + err = fscrypt_get_encryption_info(inode);
> + if (err)
> + return ERR_PTR(err);
> + } else
> + return ui->data;
> +
This will make path lookups drop out of RCU mode when an unencrypted symlink is
followed. This can be avoided by checking for unencrypted symlinks first:
if (!ubifs_crypt_is_encrypted(inode))
return ui->data;
if (!dentry)
return ERR_PTR(-ECHILD);
err = fscrypt_get_encryption_info(inode);
if (err)
return ERR_PTR(err);
> +
> + pstr.name[err] = '\0';
> +
In 4.9, fscrypt_fname_{disk_to_usr,usr_to_disk} return 0 instead of the output
length, so this will need to be changed to 'pstr.name[pstr.len] = '\0''.
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