linux-kernel - [PATCH] comedi: drivers: pcl730: Fix potential memory leak in pcl730

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Date:   Tue, 22 Nov 2022 20:04:28 +0800
From:   Shang XiaoJing <shangxiaojing@...wei.com>
To:     <abbotti@....co.uk>, <hsweeten@...ionengravers.com>,
        <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>
CC:     <shangxiaojing@...wei.com>
Subject: [PATCH] comedi: drivers: pcl730: Fix potential memory leak in pcl730_attach()

pcl730_attach() calls comedi_request_region() and won't release the
resource allocated by alloc_resource() when pcl730_attach() failed latter.
Add release_region() to prevent memory leak.

Fixes: 6f9aa29b47f6 ("staging: comedi: pcl730: use comedi_request_region()")
Signed-off-by: Shang XiaoJing <shangxiaojing@...wei.com>
---
 drivers/comedi/drivers/pcl730.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/pcl730.c b/drivers/comedi/drivers/pcl730.c
index d2733cd5383d..c463de8a14e1 100644
--- a/drivers/comedi/drivers/pcl730.c
+++ b/drivers/comedi/drivers/pcl730.c
@@ -274,8 +274,14 @@ static int pcl730_attach(struct comedi_device *dev,
 		return ret;
 
 	ret = comedi_alloc_subdevices(dev, board->n_subdevs);
-	if (ret)
+	if (ret) {
+		if (dev->iobase && dev->iolen) {
+			release_region(dev->iobase, dev->iolen);
+			dev->iobase = 0;
+			dev->iolen = 0;
+		}
 		return ret;
+	}
 
 	subdev = 0;
 
-- 
2.17.1