linux-kernel - [PATCH] comedi: test memleak

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Message-ID: <tencent_BDAF5235437278899CF4CDF1BAC24718700A@qq.com>
Date: Mon, 15 Dec 2025 15:50:00 +0800
From: xiaopeitux@...mail.com
To: syzbot+f238baf6ded841b5a82e@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	Pei Xiao <xiaopei01@...inos.cn>
Subject: [PATCH] comedi: test memleak

From: Pei Xiao <xiaopei01@...inos.cn>

#syz test
---
 drivers/comedi/comedi_fops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c
index 657c98cd723e..60fb3b0656c1 100644
--- a/drivers/comedi/comedi_fops.c
+++ b/drivers/comedi/comedi_fops.c
@@ -1893,6 +1893,8 @@ static int do_cmd_ioctl(struct comedi_device *dev,
 
 	ret = s->do_cmdtest(dev, s, &async->cmd);
 
+	kfree(cmd->chanlist);   /* free kernel copy of user chanlist */
+
 	if (async->cmd.flags & CMDF_BOGUS || ret) {
 		dev_dbg(dev->class_dev, "test returned %d\n", ret);
 		*cmd = async->cmd;
-- 
2.25.1