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| author | David Sterba <dsterba@suse.com> | 2016-04-26 16:03:57 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-07 18:18:54 -0700 |
| commit | 1a0608e8df73a6b6902d5d154ab3abb546b43d8e (patch) | |
| tree | 6d5709b872767a7ff3efa57e272ac508f3660d71 | |
| parent | 296f8da334a009ea2ec8112c2a1ac318872eff87 (diff) | |
| download | linux-stable-1a0608e8df73a6b6902d5d154ab3abb546b43d8e.tar.gz linux-stable-1a0608e8df73a6b6902d5d154ab3abb546b43d8e.tar.bz2 linux-stable-1a0608e8df73a6b6902d5d154ab3abb546b43d8e.zip | |
btrfs: add check to sysfs handler of label
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 <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/btrfs/sysfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
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; |