diff options
| author | Jan Schmidt | 2013-05-28 17:47:23 +0200 |
|---|---|---|
| committer | Josef Bacik | 2013-06-14 17:30:08 +0200 |
| commit | eb1716af887375f1e2099f69bb89dfc5bd169bfa (patch) | |
| tree | 634461e97227d6d75b3e05f47567bd1d1478beb2 /fs/btrfs/qgroup.c | |
| parent | Btrfs: fix memory patcher through fs_info->qgroup_ulist (diff) | |
| download | kernel-qcow2-linux-eb1716af887375f1e2099f69bb89dfc5bd169bfa.tar.gz kernel-qcow2-linux-eb1716af887375f1e2099f69bb89dfc5bd169bfa.tar.xz kernel-qcow2-linux-eb1716af887375f1e2099f69bb89dfc5bd169bfa.zip | |
Btrfs: avoid double free of fs_info->qgroup_ulist
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>
Diffstat (limited to 'fs/btrfs/qgroup.c')
| -rw-r--r-- | fs/btrfs/qgroup.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 74b432d0b703..c6ce64276869 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -430,8 +430,10 @@ out: } btrfs_free_path(path); - if (ret < 0) + if (ret < 0) { ulist_free(fs_info->qgroup_ulist); + fs_info->qgroup_ulist = NULL; + } return ret < 0 ? ret : 0; } @@ -932,8 +934,10 @@ out_free_root: kfree(quota_root); } out: - if (ret) + if (ret) { ulist_free(fs_info->qgroup_ulist); + fs_info->qgroup_ulist = NULL; + } mutex_unlock(&fs_info->qgroup_ioctl_lock); return ret; } |