linux-kernel - [PATCH] i2c: fix WARNING in pvr2_i2c_core

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Date:   Tue, 21 Jul 2020 16:40:07 +0530
From:   B K Karthik <bkkarthik@...u.pes.edu>
To:     syzbot+e74a998ca8f1df9cc332@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com, gregkh@...uxfoundation.org,
        skhan@...uxfoundation.org,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Mike Isely <isely@...ox.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: fix WARNING in pvr2_i2c_core_done

#syz test: https://github.com/google/kasan.git usb-fuzzer

fix WARNING in pvr2_i2c_core_done by
unregistering device in the release handler
instead of the disconnect handler.

Reported-by: syzbot+e74a998ca8f1df9cc332@...kaller.appspotmail.com
Signed-off-by: B K Karthik <bkkarthik@...u.pes.edu>
---
 drivers/i2c/i2c-core-base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 26f03a14a478..2d377d2e89f1 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -462,6 +462,7 @@ static void i2c_device_shutdown(struct device *dev)
 
 static void i2c_client_dev_release(struct device *dev)
 {
+	i2c_unregister_device(to_i2c_client(dev));
 	kfree(to_i2c_client(dev));
 }
 
@@ -1527,7 +1528,6 @@ void i2c_del_adapter(struct i2c_adapter *adap)
 		dev_dbg(&adap->dev, "Removing %s at 0x%x\n", client->name,
 			client->addr);
 		list_del(&client->detected);
-		i2c_unregister_device(client);
 	}
 	mutex_unlock(&adap->userspace_clients_lock);
 
-- 
2.20.1


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