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Message-Id: <20231018141525.1335533-7-sashal@kernel.org>
Date: Wed, 18 Oct 2023 10:15:23 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Javier Carrasco <javier.carrasco.cruz@...il.com>,
syzbot+0434ac83f907a1dbdd1e@...kaller.appspotmail.com,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Sasha Levin <sashal@...nel.org>, linux-input@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 7/7] Input: powermate - fix use-after-free in powermate_config_complete
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
[ Upstream commit 5c15c60e7be615f05a45cd905093a54b11f461bc ]
syzbot has found a use-after-free bug [1] in the powermate driver. This
happens when the device is disconnected, which leads to a memory free from
the powermate_device struct. When an asynchronous control message
completes after the kfree and its callback is invoked, the lock does not
exist anymore and hence the bug.
Use usb_kill_urb() on pm->config to cancel any in-progress requests upon
device disconnection.
[1] https://syzkaller.appspot.com/bug?extid=0434ac83f907a1dbdd1e
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
Reported-by: syzbot+0434ac83f907a1dbdd1e@...kaller.appspotmail.com
Link: https://lore.kernel.org/r/20230916-topic-powermate_use_after_free-v3-1-64412b81a7a2@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/input/misc/powermate.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/input/misc/powermate.c b/drivers/input/misc/powermate.c
index c4e0e1886061f..6b1b95d58e6b5 100644
--- a/drivers/input/misc/powermate.c
+++ b/drivers/input/misc/powermate.c
@@ -425,6 +425,7 @@ static void powermate_disconnect(struct usb_interface *intf)
pm->requires_update = 0;
usb_kill_urb(pm->irq);
input_unregister_device(pm->input);
+ usb_kill_urb(pm->config);
usb_free_urb(pm->irq);
usb_free_urb(pm->config);
powermate_free_buffers(interface_to_usbdev(intf), pm);
--
2.40.1
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