diff options
| -rw-r--r-- | fs/btrfs/sysfs.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 12e53556e214..82a968fdfd80 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -363,7 +363,8 @@ static ssize_t btrfs_label_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) { struct btrfs_fs_info *fs_info = to_fs_info(kobj); - return snprintf(buf, PAGE_SIZE, "%s\n", fs_info->super_copy->label); + char *label = fs_info->super_copy->label; + return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); } static ssize_t btrfs_label_store(struct kobject *kobj, @@ -374,8 +375,15 @@ static ssize_t btrfs_label_store(struct kobject *kobj, struct btrfs_trans_handle *trans; struct btrfs_root *root = fs_info->fs_root; int ret; + size_t p_len; - if (len >= BTRFS_LABEL_SIZE) + /* + * p_len is the len until the first occurrence of either + * '\n' or '\0' + */ + p_len = strcspn(buf, "\n"); + + if (p_len >= BTRFS_LABEL_SIZE) return -EINVAL; trans = btrfs_start_transaction(root, 0); @@ -383,7 +391,8 @@ static ssize_t btrfs_label_store(struct kobject *kobj, return PTR_ERR(trans); spin_lock(&root->fs_info->super_lock); - strcpy(fs_info->super_copy->label, buf); + memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); + memcpy(fs_info->super_copy->label, buf, p_len); spin_unlock(&root->fs_info->super_lock); ret = btrfs_commit_transaction(trans, root); |