From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:59836 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932316AbdJWM5w (ORCPT ); Mon, 23 Oct 2017 08:57:52 -0400 Subject: Patch "usb: xhci: Handle error condition in xhci_stop_device()" has been added to the 4.13-stable tree To: mrana@codeaurora.org, gregkh@linuxfoundation.org, jackp@codeaurora.org, mathias.nyman@linux.intel.com Cc: , From: Date: Mon, 23 Oct 2017 14:56:45 +0200 Message-ID: <150876340515156@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled usb: xhci: Handle error condition in xhci_stop_device() to the 4.13-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-xhci-handle-error-condition-in-xhci_stop_device.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From b3207c65dfafae27e7c492cb9188c0dc0eeaf3fd Mon Sep 17 00:00:00 2001 From: Mayank Rana Date: Fri, 6 Oct 2017 17:45:30 +0300 Subject: usb: xhci: Handle error condition in xhci_stop_device() From: Mayank Rana commit b3207c65dfafae27e7c492cb9188c0dc0eeaf3fd upstream. xhci_stop_device() calls xhci_queue_stop_endpoint() multiple times without checking the return value. xhci_queue_stop_endpoint() can return error if the HC is already halted or unable to queue commands. This can cause a deadlock condition as xhci_stop_device() would end up waiting indefinitely for a completion for the command that didn't get queued. Fix this by checking the return value and bailing out of xhci_stop_device() in case of error. This patch happens to fix potential memory leaks of the allocated command structures as well. Fixes: c311e391a7ef ("xhci: rework command timeout and cancellation,") Signed-off-by: Mayank Rana Signed-off-by: Jack Pham Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-hub.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -420,14 +420,25 @@ static int xhci_stop_device(struct xhci_ GFP_NOWAIT); if (!command) { spin_unlock_irqrestore(&xhci->lock, flags); - xhci_free_command(xhci, cmd); - return -ENOMEM; + ret = -ENOMEM; + goto cmd_cleanup; + } + + ret = xhci_queue_stop_endpoint(xhci, command, slot_id, + i, suspend); + if (ret) { + spin_unlock_irqrestore(&xhci->lock, flags); + xhci_free_command(xhci, command); + goto cmd_cleanup; } - xhci_queue_stop_endpoint(xhci, command, slot_id, i, - suspend); } } - xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend); + ret = xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend); + if (ret) { + spin_unlock_irqrestore(&xhci->lock, flags); + goto cmd_cleanup; + } + xhci_ring_cmd_db(xhci); spin_unlock_irqrestore(&xhci->lock, flags); @@ -439,6 +450,8 @@ static int xhci_stop_device(struct xhci_ xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n"); ret = -ETIME; } + +cmd_cleanup: xhci_free_command(xhci, cmd); return ret; } Patches currently in stable-queue which might be from mrana@codeaurora.org are queue-4.13/usb-xhci-handle-error-condition-in-xhci_stop_device.patch