linux-kernel - [PATCH AUTOSEL 4.19 49/68] HID: hiddev: do cleanup in failure of opening a device

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Date:   Tue, 13 Aug 2019 22:15:27 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hillf Danton <hdanton@...a.com>,
        syzbot <syzbot+62a1e04fd3ec2abf099e@...kaller.appspotmail.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Jiri Kosina <jkosina@...e.cz>, Sasha Levin <sashal@...nel.org>,
        linux-usb@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 49/68] HID: hiddev: do cleanup in failure of opening a device

From: Hillf Danton <hdanton@...a.com>

[ Upstream commit 6d4472d7bec39917b54e4e80245784ea5d60ce49 ]

Undo what we did for opening before releasing the memory slice.

Reported-by: syzbot <syzbot+62a1e04fd3ec2abf099e@...kaller.appspotmail.com>
Cc: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Hillf Danton <hdanton@...a.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hid/usbhid/hiddev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index 56da33bc3862e..5a949ca42b1d0 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -321,6 +321,10 @@ static int hiddev_open(struct inode *inode, struct file *file)
 	hid_hw_power(hid, PM_HINT_NORMAL);
 bail_unlock:
 	mutex_unlock(&hiddev->existancelock);
+
+	spin_lock_irq(&list->hiddev->list_lock);
+	list_del(&list->node);
+	spin_unlock_irq(&list->hiddev->list_lock);
 bail:
 	file->private_data = NULL;
 	vfree(list);
-- 
2.20.1