Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in driver_remove_file

[Edward Adam Davis]

#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)