linux-kernel - [PATCH v2 4/9] crypto: hisilicon/debugfs - Fix the processing logic issue in the debugfs creation

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Date: Sun, 7 Apr 2024 15:59:55 +0800
From: Chenghai Huang <huangchenghai2@...wei.com>
To: <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
	<fanghao11@...wei.com>, <liulongfang@...wei.com>, <shenyang39@...wei.com>,
	<songzhiqi1@...wei.com>, <qianweili@...wei.com>, <liushangbin@...ilicon.com>,
	<linwenkai6@...ilicon.com>, <taoqi10@...wei.com>, <wangzhou1@...ilicon.com>,
	<huangchenghai2@...wei.com>
Subject: [PATCH v2 4/9] crypto: hisilicon/debugfs - Fix the processing logic issue in the debugfs creation

There is a scenario where the file directory is created but the
file attribute is not set. In this case, if a user accesses the
file, an error occurs.

So adjust the processing logic in the debugfs creation to
prevent the file from being accessed before the file attributes
such as the index are set.

Signed-off-by: Chenghai Huang <huangchenghai2@...wei.com>
---
 drivers/crypto/hisilicon/debugfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/hisilicon/debugfs.c b/drivers/crypto/hisilicon/debugfs.c
index 6351a452878d..e9fa42381242 100644
--- a/drivers/crypto/hisilicon/debugfs.c
+++ b/drivers/crypto/hisilicon/debugfs.c
@@ -1090,12 +1090,12 @@ static void qm_create_debugfs_file(struct hisi_qm *qm, struct dentry *dir,
 {
 	struct debugfs_file *file = qm->debug.files + index;
 
-	debugfs_create_file(qm_debug_file_name[index], 0600, dir, file,
-			    &qm_debug_fops);
-
 	file->index = index;
 	mutex_init(&file->lock);
 	file->debug = &qm->debug;
+
+	debugfs_create_file(qm_debug_file_name[index], 0600, dir, file,
+			    &qm_debug_fops);
 }
 
 static int qm_debugfs_atomic64_set(void *data, u64 val)
-- 
2.30.0