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=-4.0 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,UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 1C16BC742B9 for ; Fri, 12 Jul 2019 12:23:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E0B3B216FD for ; Fri, 12 Jul 2019 12:23:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562934223; bh=kkrwADmsFdGw9iAWHFHMsOpjY/8rQPkoENMN+/bHssM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=sWmAf0HEUCPiA0n53F9lLJEQhIBB2nD0EgOwaTvGkL6/kbwChCqi9hIr9ZUxe+Oq0 9WSZMntyPYFjgjt9DPOgyGUwpmd+AB/WV1mg7R1RfEPNtV43j5uOR9o52me+bc9Lcg ayiDS+5BMhmG4w12iJNdIEZZ7eebgsYayQ7kij+s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727973AbfGLMXk (ORCPT ); Fri, 12 Jul 2019 08:23:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:59394 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727964AbfGLMXf (ORCPT ); Fri, 12 Jul 2019 08:23:35 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 65031208E4; Fri, 12 Jul 2019 12:23:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562934214; bh=kkrwADmsFdGw9iAWHFHMsOpjY/8rQPkoENMN+/bHssM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RZTHOCgTkNaUjtg6FpfyOP+VWlXPOOhmWohgvyNrvNprWd9UkJrygMEKstKm2QVk1 4/l1nHQq1YdfJpR5Fex0UJ3GOVFAObwjRXDO01FaZinV5GDlbyPxwGI01V3xaEpKpF 1oEtqWsAPIwC55MRmrc33Uw5PcLv+hYV1EStF11A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kiruthika Varadarajan , Felipe Balbi Subject: [PATCH 4.19 73/91] usb: gadget: ether: Fix race between gether_disconnect and rx_submit Date: Fri, 12 Jul 2019 14:19:16 +0200 Message-Id: <20190712121625.737094366@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190712121621.422224300@linuxfoundation.org> References: <20190712121621.422224300@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: Kiruthika Varadarajan commit d29fcf7078bc8be2b6366cbd4418265b53c94fac upstream. On spin lock release in rx_submit, gether_disconnect get a chance to run, it makes port_usb NULL, rx_submit access NULL port USB, hence null pointer crash. Fixed by releasing the lock in rx_submit after port_usb is used. Fixes: 2b3d942c4878 ("usb ethernet gadget: split out network core") Cc: Signed-off-by: Kiruthika Varadarajan Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/u_ether.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/usb/gadget/function/u_ether.c +++ b/drivers/usb/gadget/function/u_ether.c @@ -186,11 +186,12 @@ rx_submit(struct eth_dev *dev, struct us out = dev->port_usb->out_ep; else out = NULL; - spin_unlock_irqrestore(&dev->lock, flags); if (!out) + { + spin_unlock_irqrestore(&dev->lock, flags); return -ENOTCONN; - + } /* Padding up to RX_EXTRA handles minor disagreements with host. * Normally we use the USB "terminate on short read" convention; @@ -214,6 +215,7 @@ rx_submit(struct eth_dev *dev, struct us if (dev->port_usb->is_fixed) size = max_t(size_t, size, dev->port_usb->fixed_out_len); + spin_unlock_irqrestore(&dev->lock, flags); skb = __netdev_alloc_skb(dev->net, size + NET_IP_ALIGN, gfp_flags); if (skb == NULL) {