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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 D457CC432C0 for ; Mon, 18 Nov 2019 07:53:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B70F12068D for ; Mon, 18 Nov 2019 07:53:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726472AbfKRHxa (ORCPT ); Mon, 18 Nov 2019 02:53:30 -0500 Received: from mga07.intel.com ([134.134.136.100]:29559 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726315AbfKRHxa (ORCPT ); Mon, 18 Nov 2019 02:53:30 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Nov 2019 23:53:28 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,319,1569308400"; d="scan'208";a="196047576" Received: from rongch2-mobl.ccr.corp.intel.com (HELO [10.255.29.39]) ([10.255.29.39]) by orsmga007.jf.intel.com with ESMTP; 17 Nov 2019 23:53:24 -0800 Subject: Re: [LKP] Re: [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference,address To: David Howells , kernel test robot Cc: torvalds@linux-foundation.org, Rasmus Villemoes , Greg Kroah-Hartman , Peter Zijlstra , nicolas.dichtel@6wind.com, raven@themaw.net, Christian Brauner , keyrings@vger.kernel.org, linux-usb@vger.kernel.org, linux-block@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, lkp@lists.01.org References: <9279.1573824532@warthog.procyon.org.uk> <20191110031348.GE29418@shao2-debian> <6853.1573834946@warthog.procyon.org.uk> From: kernel test robot Message-ID: <35daca93-ff2b-2c7d-b837-72396ca0677a@intel.com> Date: Mon, 18 Nov 2019 15:53:22 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <6853.1573834946@warthog.procyon.org.uk> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hi David, Yes, it can fix the problem. Best Regards, Rong Chen On 11/16/2019 12:22 AM, David Howells wrote: > Actually, no, this is the fix: > > diff --git a/lib/iov_iter.c b/lib/iov_iter.c > index 7006b5b2106d..be2fc5793ddd 100644 > --- a/lib/iov_iter.c > +++ b/lib/iov_iter.c > @@ -537,7 +537,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size, > buf->ops = &default_pipe_buf_ops; > buf->page = page; > buf->offset = 0; > - buf->len = max_t(ssize_t, left, PAGE_SIZE); > + buf->len = min_t(ssize_t, left, PAGE_SIZE); > left -= buf->len; > iter_head++; > pipe->head = iter_head; > > David > _______________________________________________ > LKP mailing list -- lkp@lists.01.org > To unsubscribe send an email to lkp-leave@lists.01.org