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btrfs: add check to sysfs handler of label

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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>
This commit is contained in:
David Sterba 2016-04-26 16:03:57 +02:00
parent ee6111386a
commit 66ac9fe7ba
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/sysfs.c
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@ -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;