[PATCH] comedi: test kmemleak

[xiaopeitux]

From: Pei Xiao <xiaopei01@xxxxxxxxxx>

#syz test
---
 drivers/comedi/comedi_fops.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c
index 657c98cd723e..283a64613208 100644
--- a/drivers/comedi/comedi_fops.c
+++ b/drivers/comedi/comedi_fops.c
@@ -1935,6 +1935,11 @@ static int do_cmd_ioctl(struct comedi_device *dev,
 		return 0;
 
 cleanup:
+
+	if (async && async->cmd.chanlist) {
+		kfree(async->cmd.chanlist);
+		async->cmd.chanlist = NULL;
+	}
 	do_become_nonbusy(dev, s);
 
 	return ret;
-- 
2.25.1