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,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 5F708C43331 for ; Wed, 1 Apr 2020 16:29:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2B062212CC for ; Wed, 1 Apr 2020 16:29:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585758543; bh=Gyq5CPIWhGyETl7u146YtvZnj20MLETTWKjndr0vl/0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=sJ4GuUBMSK3ik0qroKqM1drKi8AErPDe7Eeg6981gvf/60ScJD2JxLOi5Qpqx5d8N lKK5/o2xMN2Qw8ehoBLha1XuTdXDR6rUksb8nNefcu/DXUUu/oHpqfqc14HFjYcUJr 2X8PKEAnEJUtVCPNpvo5Y8V6ZzXA9CU14Ew74pqQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387993AbgDAQ3C (ORCPT ); Wed, 1 Apr 2020 12:29:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:54424 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387558AbgDAQ27 (ORCPT ); Wed, 1 Apr 2020 12:28:59 -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 96EC720BED; Wed, 1 Apr 2020 16:28:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585758539; bh=Gyq5CPIWhGyETl7u146YtvZnj20MLETTWKjndr0vl/0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=obS2t/VkCg6vfmwF38a52LTpobpT55+GiR9Yn/hC1C96xtVC2wfQF+OXBoIfKIwn6 FaBVgKLGIx0T+qoHZUXjC3+kkLzGEw9DwKpzgNMIPMycxXCJt7c4q/TX6Mk+gKJtTg P5dLKtQiPpFGSn2PxAjNYMvwDOH/zqq2A6ln+BzI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Qiujun Huang , Johan Hovold , syzbot+37ba33391ad5f3935bbd@syzkaller.appspotmail.com Subject: [PATCH 4.19 083/116] USB: serial: io_edgeport: fix slab-out-of-bounds read in edge_interrupt_callback Date: Wed, 1 Apr 2020 18:17:39 +0200 Message-Id: <20200401161553.151464218@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200401161542.669484650@linuxfoundation.org> References: <20200401161542.669484650@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: Qiujun Huang commit 57aa9f294b09463492f604feaa5cc719beaace32 upstream. Fix slab-out-of-bounds read in the interrupt-URB completion handler. The boundary condition should be (length - 1) as we access data[position + 1]. Reported-and-tested-by: syzbot+37ba33391ad5f3935bbd@syzkaller.appspotmail.com Signed-off-by: Qiujun Huang Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/io_edgeport.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/serial/io_edgeport.c +++ b/drivers/usb/serial/io_edgeport.c @@ -710,7 +710,7 @@ static void edge_interrupt_callback(stru /* grab the txcredits for the ports if available */ position = 2; portNumber = 0; - while ((position < length) && + while ((position < length - 1) && (portNumber < edge_serial->serial->num_ports)) { txCredits = data[position] | (data[position+1] << 8); if (txCredits) {