From: zhangyi (F) <yi.zhang@huawei.com>
Date: Wed, 1 Nov 2017 10:40:45 +0000 (+0800)
Subject: quota: fix potential infinite loop
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=dd5f6279732e8885061d7455b9d86fdcfdf7f183;p=linux.git

quota: fix potential infinite loop

In dquot_writeback_dquots(), we write back dquot from dirty dquots
list. There is a potential infinite loop if ->write_dquot() failure
and forget remove dquot from the list. This patch clear dirty bit
anyway to avoid it.

Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 50b0556a124f2..f68397923ebb5 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -644,8 +644,15 @@ int dquot_writeback_dquots(struct super_block *sb, int type)
 			spin_unlock(&dq_list_lock);
 			dqstats_inc(DQST_LOOKUPS);
 			err = sb->dq_op->write_dquot(dquot);
-			if (!ret && err)
-				ret = err;
+			if (err) {
+				/*
+				 * Clear dirty bit anyway to avoid infinite
+				 * loop here.
+				 */
+				clear_dquot_dirty(dquot);
+				if (!ret)
+					ret = err;
+			}
 			dqput(dquot);
 			spin_lock(&dq_list_lock);
 		}