linux-kernel - [PATCH V2 1/2] interconnect: Add character pointer initialization

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Message-ID: <20240914102435.3879355-1-Yibin.Ding@unisoc.com>
Date: Sat, 14 Sep 2024 18:24:35 +0800
From: Yibin Ding <Yibin.Ding@...soc.com>
To: <djakov@...nel.org>, <gregkh@...uxfoundation.org>, <rafael@...nel.org>
CC: <yibin.ding01@...il.com>, <niuzhiguo84@...il.com>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Hao_hao.Wang@...soc.com>, <Ke.Wang@...soc.com>
Subject: [PATCH V2 1/2] interconnect: Add character pointer initialization

From: Yibin Ding <Yibin.ding@...soc.com>

When accessing a node whose data type is a character pointer and has not
been initialized, a crash will occur due to accessing a null pointer. So
it is necessary to add the operation of initializing the character pointer.
Since the debugfs_write_file_str() function performs a kfree() operation
on the node data, memory is allocated to the node pointer during
initialization will be released when data is written to the node.

Signed-off-by: Yibin Ding <Yibin.ding@...soc.com>
---
 drivers/interconnect/debugfs-client.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/interconnect/debugfs-client.c b/drivers/interconnect/debugfs-client.c
index bc3fd8a7b9eb..a1c99b9d3b9a 100644
--- a/drivers/interconnect/debugfs-client.c
+++ b/drivers/interconnect/debugfs-client.c
@@ -147,8 +147,13 @@ int icc_debugfs_client_init(struct dentry *icc_dir)
 
 	client_dir = debugfs_create_dir("test_client", icc_dir);
 
-	debugfs_create_str("src_node", 0600, client_dir, &src_node);
-	debugfs_create_str("dst_node", 0600, client_dir, &dst_node);
+	src_node = kzalloc(sizeof(src_node), GFP_KERNEL);
+	dst_node = kzalloc(sizeof(dst_node), GFP_KERNEL);
+
+	if (src_node)
+		debugfs_create_str("src_node", 0600, client_dir, &src_node);
+	if (dst_node)
+		debugfs_create_str("dst_node", 0600, client_dir, &dst_node);
 	debugfs_create_file("get", 0200, client_dir, NULL, &icc_get_fops);
 	debugfs_create_u32("avg_bw", 0600, client_dir, &avg_bw);
 	debugfs_create_u32("peak_bw", 0600, client_dir, &peak_bw);
-- 
2.25.1