This is a note to let you know that I've just added the patch titled
usb: usbip: add missing device lock on tweak configuration cmd
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-usbip-add-missing-device-lock-on-tweak-configura.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 604822b756d058d912520ae28c7a45a659b62c44
Author: Niels Dossche <dossche.niels@xxxxxxxxx>
Date: Tue Apr 12 18:50:55 2022 +0200
usb: usbip: add missing device lock on tweak configuration cmd
[ Upstream commit d088fabace2ca337b275d1d4b36db4fe7771e44f ]
The function documentation of usb_set_configuration says that its
callers should hold the device lock. This lock is held for all
callsites except tweak_set_configuration_cmd. The code path can be
executed for example when attaching a remote USB device.
The solution is to surround the call by the device lock.
This bug was found using my experimental own-developed static analysis
tool, which reported the missing lock on v5.17.2. I manually verified
this bug report by doing code review as well. I runtime checked that
the required lock is not held. I compiled and runtime tested this on
x86_64 with a USB mouse. After applying this patch, my analyser no
longer reports this potential bug.
Fixes: 2c8c98158946 ("staging: usbip: let client choose device configuration")
Reviewed-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Niels Dossche <dossche.niels@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220412165055.257113-1-dossche.niels@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/usb/usbip/stub_rx.c b/drivers/usb/usbip/stub_rx.c
index 325c22008e53..5dd41e8215e0 100644
--- a/drivers/usb/usbip/stub_rx.c
+++ b/drivers/usb/usbip/stub_rx.c
@@ -138,7 +138,9 @@ static int tweak_set_configuration_cmd(struct urb *urb)
req = (struct usb_ctrlrequest *) urb->setup_packet;
config = le16_to_cpu(req->wValue);
+ usb_lock_device(sdev->udev);
err = usb_set_configuration(sdev->udev, config);
+ usb_unlock_device(sdev->udev);
if (err && err != -ENODEV)
dev_err(&sdev->udev->dev, "can't set config #%d, error %d\n",
config, err);
