From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60A26C3A5A1 for ; Thu, 22 Aug 2019 17:45:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2946820870 for ; Thu, 22 Aug 2019 17:45:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566495902; bh=g7i6WLTZ5rxEErYhZhpqbhfqKOn6PGX5ztul/t3P0PU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=m/8C6eHNuMuagUh3OD7DLF2fDmaAVq7NvXpsCG9ZrsqGrdzE1s0qAcoH5/RcjcU7U OQZ9U5u4jIRfDcq8b6LwqGKRltB9Oky6S99ctj7yQRS5Kzq+lXgCps4Vw1F2VPXvI2 fkftrO4ETsFS3t5Pv+Oc1SCh55jTS/CsDc2t/D7M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392893AbfHVRpB (ORCPT ); Thu, 22 Aug 2019 13:45:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:42482 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403863AbfHVRXM (ORCPT ); Thu, 22 Aug 2019 13:23:12 -0400 Received: from localhost (wsip-184-188-36-2.sd.sd.cox.net [184.188.36.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8472B23405; Thu, 22 Aug 2019 17:23:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566494591; bh=g7i6WLTZ5rxEErYhZhpqbhfqKOn6PGX5ztul/t3P0PU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xOtcFiSPu6AIJhZZsRqlB+zoH4AI9tbiGk3RDkgin678qO5LxfOPMvJPn/BNVtuu1 dvGmzxq8UoBomUtXXxbZRx8DZDNm9wYCQfiQl8837kVv8sEqEGsEpnJq1IjMFCWXWG VNRrK3XfV9xh0NEsRIsbsYvlGZCxTFJ5uNBG+w1s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stephane Grosjean , Marc Kleine-Budde Subject: [PATCH 4.9 011/103] can: peak_usb: fix potential double kfree_skb() Date: Thu, 22 Aug 2019 10:17:59 -0700 Message-Id: <20190822171729.313350455@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190822171728.445189830@linuxfoundation.org> References: <20190822171728.445189830@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stephane Grosjean commit fee6a8923ae0d318a7f7950c6c6c28a96cea099b upstream. When closing the CAN device while tx skbs are inflight, echo skb could be released twice. By calling close_candev() before unlinking all pending tx urbs, then the internal echo_skb[] array is fully and correctly cleared before the USB write callback and, therefore, can_get_echo_skb() are called, for each aborted URB. Fixes: bb4785551f64 ("can: usb: PEAK-System Technik USB adapters driver core") Signed-off-by: Stephane Grosjean Cc: linux-stable Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/usb/peak_usb/pcan_usb_core.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c @@ -592,16 +592,16 @@ static int peak_usb_ndo_stop(struct net_ dev->state &= ~PCAN_USB_STATE_STARTED; netif_stop_queue(netdev); + close_candev(netdev); + + dev->can.state = CAN_STATE_STOPPED; + /* unlink all pending urbs and free used memory */ peak_usb_unlink_all_urbs(dev); if (dev->adapter->dev_stop) dev->adapter->dev_stop(dev); - close_candev(netdev); - - dev->can.state = CAN_STATE_STOPPED; - /* can set bus off now */ if (dev->adapter->dev_set_bus) { int err = dev->adapter->dev_set_bus(dev, 0);