From: Oliver Neukum oneukum@suse.com

stable inclusion from stable-v6.6.46 commit 128e82e41cf7d74a562726c1587d9d2ede1a0a37 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAM59O CVE: CVE-2024-43883

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit afdcfd3d6fcdeca2735ca8d994c5f2d24a368f0a upstream.

At a few places the driver carries stale pointers to references that can still be used. Make sure that does not happen. This strictly speaking closes ZDI-CAN-22273, though there may be similar races in the driver.

Signed-off-by: Oliver Neukum oneukum@suse.com Cc: stable stable@kernel.org Acked-by: Shuah Khan skhan@linuxfoundation.org Link: https://lore.kernel.org/r/20240709113851.14691-1-oneukum@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: ZhangPeng zhangpeng362@huawei.com Signed-off-by: Zheng Yejian zhengyejian1@huawei.com --- drivers/usb/usbip/vhci_hcd.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c index 37d1fc34e8a5..14a5f55f24fc 100644 --- a/drivers/usb/usbip/vhci_hcd.c +++ b/drivers/usb/usbip/vhci_hcd.c @@ -745,6 +745,7 @@ static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flag * */ if (usb_pipedevice(urb->pipe) == 0) { + struct usb_device *old; __u8 type = usb_pipetype(urb->pipe); struct usb_ctrlrequest *ctrlreq = (struct usb_ctrlrequest *) urb->setup_packet; @@ -755,14 +756,15 @@ static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flag goto no_need_xmit; }

+ old = vdev->udev; switch (ctrlreq->bRequest) { case USB_REQ_SET_ADDRESS: /* set_address may come when a device is reset */ dev_info(dev, "SetAddress Request (%d) to port %d\n", ctrlreq->wValue, vdev->rhport);

- usb_put_dev(vdev->udev); vdev->udev = usb_get_dev(urb->dev); + usb_put_dev(old);

spin_lock(&vdev->ud.lock); vdev->ud.status = VDEV_ST_USED; @@ -781,8 +783,8 @@ static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flag usbip_dbg_vhci_hc( "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");

- usb_put_dev(vdev->udev); vdev->udev = usb_get_dev(urb->dev); + usb_put_dev(old); goto out;

default: @@ -1067,6 +1069,7 @@ static void vhci_shutdown_connection(struct usbip_device *ud) static void vhci_device_reset(struct usbip_device *ud) { struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); + struct usb_device *old = vdev->udev; unsigned long flags;

spin_lock_irqsave(&ud->lock, flags); @@ -1074,8 +1077,8 @@ static void vhci_device_reset(struct usbip_device *ud) vdev->speed = 0; vdev->devid = 0;

- usb_put_dev(vdev->udev); vdev->udev = NULL; + usb_put_dev(old);

if (ud->tcp_socket) { sockfd_put(ud->tcp_socket);