[Ocfs2-devel] [PATCH v1] ocfs2: Fix freeing uninitialized resource on ocfs2_dlm_shutdown
Joseph Qi
joseph.qi at linux.alibaba.com
Mon Aug 15 08:06:50 UTC 2022
On 8/11/22 5:46 PM, Heming Zhao wrote:
> On local mount mode, no dlm resource is initialized. If
> ocfs2_mount_volume() fails in ocfs2_find_slot(), error handling
In fact, any procedure after ocfs2_dlm_init() fails will trigger this
issue. So we'd better describe it clearly, or just take the above case
as a example.
> will call ocfs2_dlm_shutdown(), then does dlm resource cleanup
> job, which will trigger kernel crash.
>
> Fixes: 0737e01de9c4 ("ocfs2: ocfs2_mount_volume does cleanup job before return error")
> Signed-off-by: Heming Zhao <heming.zhao at suse.com>
> ---
> draft -> v1:
> - separate to a single patch
> - by review comment:
> - do free lockres in shutdown path
> - put 'Fixes' string in one line
> - revise misspelled & grammar mistake in commit log
> ---
> fs/ocfs2/dlmglue.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index 801e60bab955..c28bc983a7b1 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -3403,10 +3403,12 @@ void ocfs2_dlm_shutdown(struct ocfs2_super *osb,
> ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres);
> ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres);
>
> - ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
> - osb->cconn = NULL;
> + if (osb->cconn) {
> + ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
> + osb->cconn = NULL;
>
> - ocfs2_dlm_shutdown_debug(osb);
> + ocfs2_dlm_shutdown_debug(osb);
> + }
> }
>
> static int ocfs2_drop_lock(struct ocfs2_super *osb,
The checking osb->cconn in ocfs2_dismount_volume() has to be removed.
Thanks,
Joseph
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