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

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Message-Id: <20210908102055.10168-1-cymi20@fudan.edu.cn>
Date:   Wed,  8 Sep 2021 18:20:55 +0800
From:   Chenyuan Mi <cymi20@...an.edu.cn>
To:     unlisted-recipients:; (no To-header on input)
Cc:     yuanxzhang@...an.edu.cn, Chenyuan Mi <cymi20@...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>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org
Subject: [PATCH v2] ocfs2: Fix handle refcount leak in two exception handling paths

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>
---
 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;
 			}
-- 
2.17.1