Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755756AbaGHTTS (ORCPT ); Tue, 8 Jul 2014 15:19:18 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:54327 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755749AbaGHTIm (ORCPT ); Tue, 8 Jul 2014 15:08:42 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Johan Hovold" , "Greg Kroah-Hartman" Date: Tue, 08 Jul 2014 20:01:50 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 038/125] USB: cdc-acm: fix potential urb leak and PM imbalance in write In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.249 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.61-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 183a45087d126d126e8dd1d9b2602fc129dff9ad upstream. Make sure to check return value of autopm get in write() in order to avoid urb leak and PM counter imbalance on errors. Fixes: 11ea859d64b6 ("USB: additional power savings for cdc-acm devices that support remote wakeup") Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman [bwh: Backported to 3.2: - Adjust context - Error/status variable is called rc, not stat] Signed-off-by: Ben Hutchings --- drivers/usb/class/cdc-acm.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -191,7 +191,13 @@ static int acm_write_start(struct acm *a dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__, acm->susp_count); - usb_autopm_get_interface_async(acm->control); + rc = usb_autopm_get_interface_async(acm->control); + if (rc) { + wb->use = 0; + spin_unlock_irqrestore(&acm->write_lock, flags); + return rc; + } + if (acm->susp_count) { usb_anchor_urb(wb->urb, &acm->delayed); spin_unlock_irqrestore(&acm->write_lock, flags); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/