linux-kernel - [PATCH] ext4: check return value of kstrtoull correctly in reserved_clusters

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Message-ID: <20170615095730.36627-1-yuchao0@huawei.com>
Date:   Thu, 15 Jun 2017 17:57:30 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <tytso@....edu>, <adilger.kernel@...ger.ca>
CC:     <linux-ext4@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yuchao0@...wei.com>, <chao@...nel.org>,
        Miao Xie <miaoxie@...wei.com>
Subject: [PATCH] ext4: check return value of kstrtoull correctly in reserved_clusters_store

kstrtoull returns 0 on success, however, in reserved_clusters_store we
will return -EINVAL if kstrtoull returns 0, it makes us fail to update
reserved_clusters value through sysfs.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Miao Xie <miaoxie@...wei.com>
---
 fs/ext4/sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index d74dc5f81a04..48c7a7d55ed3 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -100,7 +100,7 @@ static ssize_t reserved_clusters_store(struct ext4_attr *a,
 	int ret;
 
 	ret = kstrtoull(skip_spaces(buf), 0, &val);
-	if (!ret || val >= clusters)
+	if (ret || val >= clusters)
 		return -EINVAL;
 
 	atomic64_set(&sbi->s_resv_clusters, val);
-- 
2.13.1.388.g69e6b9b4f4a9