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Btrfs: avoid double free of fs_info->qgroup_ulist

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When btrfs_read_qgroup_config or btrfs_quota_enable return non-zero, we've
already freed the fs_info->qgroup_ulist. The final btrfs_free_qgroup_config
called from quota_disable makes another ulist_free(fs_info->qgroup_ulist)
call.

We set fs_info->qgroup_ulist to NULL on the mentioned error paths, turning
the ulist_free in btrfs_free_qgroup_config into a noop.

Cc: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Jan Schmidt 2013-05-28 15:47:23 +00:00 committed by Josef Bacik
parent 4373519db4
commit eb1716af88
1 changed files with 6 additions and 2 deletions
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8
fs/btrfs/qgroup.c
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@ -430,8 +430,10 @@ int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
} }
btrfs_free_path(path); btrfs_free_path(path);
if (ret < 0) if (ret < 0) {
ulist_free(fs_info->qgroup_ulist); ulist_free(fs_info->qgroup_ulist);
fs_info->qgroup_ulist = NULL;
}
return ret < 0 ? ret : 0; return ret < 0 ? ret : 0;
} }
@ -932,8 +934,10 @@ int btrfs_quota_enable(struct btrfs_trans_handle *trans,
kfree(quota_root); kfree(quota_root);
} }
out: out:
if (ret) if (ret) {
ulist_free(fs_info->qgroup_ulist); ulist_free(fs_info->qgroup_ulist);
fs_info->qgroup_ulist = NULL;
}
mutex_unlock(&fs_info->qgroup_ioctl_lock); mutex_unlock(&fs_info->qgroup_ioctl_lock);
return ret; return ret;
} }