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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Hillf Danton <hdanton@sina.com>,
	syzbot <syzbot+62a1e04fd3ec2abf099e@syzkaller.appspotmail.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Jiri Kosina <jkosina@suse.cz>, Sasha Levin <sashal@kernel.org>,
	linux-usb@vger.kernel.org, linux-input@vger.kernel.org
Subject: [PATCH AUTOSEL 4.4 21/28] HID: hiddev: do cleanup in failure of opening a device
Date: Tue, 13 Aug 2019 22:25:43 -0400
Message-ID: <20190814022550.17463-21-sashal@kernel.org> (raw)
In-Reply-To: <20190814022550.17463-1-sashal@kernel.org>

From: Hillf Danton <hdanton@sina.com>

[ Upstream commit 6d4472d7bec39917b54e4e80245784ea5d60ce49 ]

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

Reported-by: syzbot <syzbot+62a1e04fd3ec2abf099e@syzkaller.appspotmail.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.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 0bfc2009e4071..8903ea09ac587 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -330,6 +330,10 @@ static int hiddev_open(struct inode *inode, struct file *file)
 	return 0;
 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


      parent reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190814022550.17463-1-sashal@kernel.org>
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 10/28] net: usb: qmi_wwan: Add the BroadMobi BM818 card Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 15/28] net: usb: pegasus: fix improper read if get_registers() fail Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 20/28] HID: hiddev: avoid opening a disconnected device Sasha Levin
2019-08-14  2:25 ` Sasha Levin [this message]

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