[2024-02-23 18:45] Sasha Levin:
This is a note to let you know that I've just added the patch titled
xhci: fix possible null pointer deref during xhci urb enqueueto the 6.7-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: xhci-fix-possible-null-pointer-deref-during-xhci-urb.patch and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
commit fb9100c2c6b7b172650ba25283cc4cf9af1d082c Author: Mathias Nyman mathias.nyman@linux.intel.com Date: Fri Dec 1 17:06:47 2023 +0200
xhci: fix possible null pointer deref during xhci urb enqueue [ Upstream commit e2e2aacf042f52854c92775b7800ba668e0bdfe4 ] There is a short gap between urb being submitted and actually added to the endpoint queue (linked). If the device is disconnected during this time then usb core is not yet aware of the pending urb, and device may be freed just before xhci_urq_enqueue() continues, dereferencing the freed device. Freeing the device is protected by the xhci spinlock, so make sure we take and keep the lock while checking that device exists, dereference it, and add the urb to the queue. Remove the unnecessary URB check, usb core checks it before calling xhci_urb_enqueue() Suggested-by: Kuen-Han Tsai <khtsai@google.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20231201150647.1307406-20-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 884b0898d9c95..ddb686301af5d 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1522,24 +1522,7 @@ static int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flag struct urb_priv *urb_priv; int num_tds;
- if (!urb)
return -EINVAL;- ret = xhci_check_args(hcd, urb->dev, urb->ep,
true, true, __func__);- if (ret <= 0)
return ret ? ret : -EINVAL;- slot_id = urb->dev->slot_id; ep_index = xhci_get_endpoint_index(&urb->ep->desc);
- ep_state = &xhci->devs[slot_id]->eps[ep_index].ep_state;
- if (!HCD_HW_ACCESSIBLE(hcd))
return -ESHUTDOWN;- if (xhci->devs[slot_id]->flags & VDEV_PORT_ERROR) {
xhci_dbg(xhci, "Can't queue urb, port error, link inactive\n");return -ENODEV;- }
if (usb_endpoint_xfer_isoc(&urb->ep->desc)) num_tds = urb->number_of_packets; @@ -1578,12 +1561,35 @@ static int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flag spin_lock_irqsave(&xhci->lock, flags);
- ret = xhci_check_args(hcd, urb->dev, urb->ep,
true, true, __func__);- if (ret <= 0) {
ret = ret ? ret : -EINVAL;goto free_priv;- }
- slot_id = urb->dev->slot_id;
- if (!HCD_HW_ACCESSIBLE(hcd)) {
ret = -ESHUTDOWN;goto free_priv;- }
- if (xhci->devs[slot_id]->flags & VDEV_PORT_ERROR) {
xhci_dbg(xhci, "Can't queue urb, port error, link inactive\n");ret = -ENODEV;goto free_priv;- }
- if (xhci->xhc_state & XHCI_STATE_DYING) { xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for non-responsive xHCI host.\n", urb->ep->desc.bEndpointAddress, urb); ret = -ESHUTDOWN; goto free_priv; }
- ep_state = &xhci->devs[slot_id]->eps[ep_index].ep_state;
- if (*ep_state & (EP_GETTING_STREAMS | EP_GETTING_NO_STREAMS)) { xhci_warn(xhci, "WARN: Can't enqueue URB, ep in streams transition state %x\n", *ep_state);
Hi, this patch is causing my laptop (Dell Precision 7530) to crash during early boot with a kernel 6.7.6 with all the patches from your current stable-queue applied on top (https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree...).
Booting with "module_blacklist=xhci_pci,xhci_pci_renesas" stops the crashes. This patch was already thrown out a few weeks ago because it was causing problems:
https://lore.kernel.org/stable/2024020331-confetti-ducking-8afb@gregkh/
Regards Pascal