From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de ([195.135.220.15]:51492 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932172AbcFCPnE (ORCPT ); Fri, 3 Jun 2016 11:43:04 -0400 Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id EA574AC3D for ; Fri, 3 Jun 2016 15:43:02 +0000 (UTC) From: David Sterba To: stable@vger.kernel.org Subject: [PATCH 08/21] btrfs: add check to sysfs handler of label Date: Fri, 3 Jun 2016 17:42:24 +0200 Message-Id: <1464968544-6539-1-git-send-email-dsterba@suse.com> In-Reply-To: <20160603154006.GP29147@suse.cz> References: <20160603154006.GP29147@suse.cz> Sender: stable-owner@vger.kernel.org List-ID: commit 66ac9fe7bacf9fa76c472efc7a7aaa590c7bce6a upstream. Add a sanity check for the fs_info as we will dereference it, similar to what the 'store features' handler does. Signed-off-by: David Sterba --- fs/btrfs/sysfs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 6a6bb600b1ff..3d14618ce54b 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -377,6 +377,9 @@ static ssize_t btrfs_label_store(struct kobject *kobj, struct btrfs_fs_info *fs_info = to_fs_info(kobj); size_t p_len; + if (!fs_info) + return -EPERM; + if (fs_info->sb->s_flags & MS_RDONLY) return -EROFS; -- 2.7.1