[PATCH v2 1/2] ocfs2: cancel dqi_sync_work before freeing oinfo

[Joseph Qi <joseph.qi@linux.alibaba.com>]

ocfs2_global_read_info() will initialize and schedule dqi_sync_work at
the end, if error occurs after successfully reading global quota, it
will trigger the following warning with CONFIG_DEBUG_OBJECTS_* enabled:

ODEBUG: free active (active state 0) object: 00000000d8b0ce28 object type: timer_list hint: qsync_work_fn+0x0/0x16c

This blames there is an active delayed work when freeing oinfo in error
handling, so cancel dqi_sync_work first. BTW, return status instead of
-1 when .read_file_info fails.

Link: https://syzkaller.appspot.com/bug?extid=f7af59df5d6b25f0febd
Reported-by: syzbot+f7af59df5d6b25f0febd@syzkaller.appspotmail.com
Tested-by: syzbot+f7af59df5d6b25f0febd@syzkaller.appspotmail.com
Fixes: 171bf93ce11f ("ocfs2: Periodic quota syncing")
Cc: stable@vger.kernel.org
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
---
 fs/ocfs2/quota_local.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index 8ce462c64c51..73d3367c533b 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -692,7 +692,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
 	int status;
 	struct buffer_head *bh = NULL;
 	struct ocfs2_quota_recovery *rec;
-	int locked = 0;
+	int locked = 0, global_read = 0;
 
 	info->dqi_max_spc_limit = 0x7fffffffffffffffLL;
 	info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
@@ -700,6 +700,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
 	if (!oinfo) {
 		mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 			       " info.");
+		status = -ENOMEM;
 		goto out_err;
 	}
 	info->dqi_priv = oinfo;
@@ -712,6 +713,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
 	status = ocfs2_global_read_info(sb, type);
 	if (status < 0)
 		goto out_err;
+	global_read = 1;
 
 	status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 	if (status < 0) {
@@ -782,10 +784,12 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
 		if (locked)
 			ocfs2_inode_unlock(lqinode, 1);
 		ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
+		if (global_read)
+			cancel_delayed_work_sync(&oinfo->dqi_sync_work);
 		kfree(oinfo);
 	}
 	brelse(bh);
-	return -1;
+	return status;
 }
 
 /* Write local info to quota file */
-- 
2.39.3