linux-kernel - Re: [syzbot] [kernel?] general protection fault in pcl818_ai

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Message-ID: <20251023134612.396121-1-n.zhandarovich@fintech.ru>
Date: Thu, 23 Oct 2025 16:46:11 +0300
From: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
To: <syzbot+fce5d9d5bd067d6fbe9b@...kaller.appspotmail.com>
CC: Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
	<syzkaller-bugs@...glegroups.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [syzbot] [kernel?] general protection fault in pcl818_ai_cancel

#syz test

---
 drivers/comedi/drivers/pcl818.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/comedi/drivers/pcl818.c b/drivers/comedi/drivers/pcl818.c
index 4127adcfb229..06fe06396f23 100644
--- a/drivers/comedi/drivers/pcl818.c
+++ b/drivers/comedi/drivers/pcl818.c
@@ -1111,10 +1111,9 @@ static void pcl818_detach(struct comedi_device *dev)
 {
 	struct pcl818_private *devpriv = dev->private;
 
-	if (devpriv) {
-		pcl818_ai_cancel(dev, dev->read_subdev);
+	if (devpriv)
 		pcl818_reset(dev);
-	}
+
 	pcl818_free_dma(dev);
 	comedi_legacy_detach(dev);
 }