linux-kernel - Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in driver_remove

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Message-ID: <tencent_B8E8A6ED9ECC6C7B5E6F6C2F6D6DE096E40A@qq.com>
Date: Sun, 21 Sep 2025 19:55:00 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+a56aa983ce6a1bf12485@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in driver_remove_file

#syz test

diff --git a/drivers/comedi/drivers/c6xdigio.c b/drivers/comedi/drivers/c6xdigio.c
index 14b90d1c64dc..023c72e589a7 100644
--- a/drivers/comedi/drivers/c6xdigio.c
+++ b/drivers/comedi/drivers/c6xdigio.c
@@ -242,8 +242,10 @@ static int c6xdigio_attach(struct comedi_device *dev,
 	int ret;
 
 	ret = comedi_request_region(dev, it->options[0], 0x03);
-	if (ret)
+	if (ret) {
+		dev->driver = NULL;
 		return ret;
+	}
 
 	ret = comedi_alloc_subdevices(dev, 2);
 	if (ret)