linux-kernel - Re: [PATCH v2] ocfs2: Fix handle refcount leak in two exception handling paths

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Date:   Wed, 8 Sep 2021 18:51:32 +0800
From:   Joseph Qi <joseph.qi@...ux.alibaba.com>
To:     Chenyuan Mi <cymi20@...an.edu.cn>, akpm <akpm@...ux-foundation.org>
Cc:     yuanxzhang@...an.edu.cn, Xiyu Yang <xiyuyang19@...an.edu.cn>,
        Xin Tan <tanxin.ctf@...il.com>, Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>, ocfs2-devel@....oracle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ocfs2: Fix handle refcount leak in two exception
 handling paths



On 9/8/21 6:20 PM, Chenyuan Mi wrote:
> The reference counting issue happens in two exception handling paths
> of ocfs2_replay_truncate_records(). When executing these two exception
> handling paths, the function forgets to decrease the refcount of handle
> increased by ocfs2_start_trans(), causing a refcount leak.
> 
> Fix this issue by using ocfs2_commit_trans() to decrease the refcount
> of handle in two handling paths.
> 
> Signed-off-by: Chenyuan Mi <cymi20@...an.edu.cn>
> Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
> Signed-off-by: Xin Tan <tanxin.ctf@...il.com>

Reviewed-by: Joseph Qi <joseph.qi@...ux.alibaba.com>
> ---
>  fs/ocfs2/alloc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
> index f1cc8258d34a..b05fde7edc3a 100644
> --- a/fs/ocfs2/alloc.c
> +++ b/fs/ocfs2/alloc.c
> @@ -5940,6 +5940,7 @@ static int ocfs2_replay_truncate_records(struct ocfs2_super *osb,
>  		status = ocfs2_journal_access_di(handle, INODE_CACHE(tl_inode), tl_bh,
>  						 OCFS2_JOURNAL_ACCESS_WRITE);
>  		if (status < 0) {
> +			ocfs2_commit_trans(osb, handle);
>  			mlog_errno(status);
>  			goto bail;
>  		}
> @@ -5964,6 +5965,7 @@ static int ocfs2_replay_truncate_records(struct ocfs2_super *osb,
>  						     data_alloc_bh, start_blk,
>  						     num_clusters);
>  			if (status < 0) {
> +				ocfs2_commit_trans(osb, handle);
>  				mlog_errno(status);
>  				goto bail;
>  			}
>