From patchwork Wed Apr 1 16:18:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 228379 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=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 D5E06C2D0F2 for ; Wed, 1 Apr 2020 16:48:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 77FA7206E9 for ; Wed, 1 Apr 2020 16:48:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585759683; bh=IKlBNIhNGOdSwMXMGcHYdw2UJo0lDoL6NaGMlLD0S+M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eoZqgKuNQyDGR27bz3hPq98o9LsENzSjNIuJB96lMLYmunInNeZcCCj2jvAmBbV6l 9gvpVV+LDldAYrwmY7FHJ+nj66AZS3h2vjekgvSvx1ChkQMZ/lq+BQv/RMBKmO+KEj GRGZZKdBNCCXOlN4GaN+mDG2Ez7X5PpAjPdH2bJo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387609AbgDAQsC (ORCPT ); Wed, 1 Apr 2020 12:48:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:49952 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390106AbgDAQsB (ORCPT ); Wed, 1 Apr 2020 12:48:01 -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 B84332063A; Wed, 1 Apr 2020 16:47:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585759680; bh=IKlBNIhNGOdSwMXMGcHYdw2UJo0lDoL6NaGMlLD0S+M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bacYpaSu1polefpnhBmbzrniEhuP3dPypknyXcehCZUzk81ofjUAGNT5ThaSX4ox3 5U9xO70MwWYvqHk1rQ8YSdH+ZueTvH9Cyh82ud7+W8FvdiWBYxM5SBdYtopJYjfgfA L3O6W6zhdlLaNQJkv+W6oQml/8/o5gVOv5v63ftA= 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 4.14 118/148] USB: serial: io_edgeport: fix slab-out-of-bounds read in edge_interrupt_callback Date: Wed, 1 Apr 2020 18:18:30 +0200 Message-Id: <20200401161603.801803678@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200401161552.245876366@linuxfoundation.org> References: <20200401161552.245876366@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 @@ -714,7 +714,7 @@ 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) {