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=-6.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 B3994C43461 for ; Mon, 14 Sep 2020 11:27:46 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EB7DC208DB for ; Mon, 14 Sep 2020 11:27:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ZnFpgSWD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EB7DC208DB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3EC606B0055; Mon, 14 Sep 2020 07:27:45 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 39BA76B005A; Mon, 14 Sep 2020 07:27:45 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2B2B96B005C; Mon, 14 Sep 2020 07:27:45 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0202.hostedemail.com [216.40.44.202]) by kanga.kvack.org (Postfix) with ESMTP id 16E2D6B0055 for ; Mon, 14 Sep 2020 07:27:45 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id C52A581861CB for ; Mon, 14 Sep 2020 11:27:44 +0000 (UTC) X-FDA: 77261442048.01.woman20_430db0f27108 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id 5D67510254804 for ; Mon, 14 Sep 2020 11:27:44 +0000 (UTC) X-HE-Tag: woman20_430db0f27108 X-Filterd-Recvd-Size: 2742 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf14.hostedemail.com (Postfix) with ESMTP for ; Mon, 14 Sep 2020 11:27:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=3a9YiCRLSdfxT+zjyDP/va2bUubeehwvzanOvcg0GxQ=; b=ZnFpgSWDEryPzF8z+fHhQ7Shl2 hBFm8DenBw+/t889jQOCGrpQ0rDHOLM5QHUJqsC7TICkw+13dTLpYnqWx0CdPTLoOyu8laVcTlmOI yxVmM2AFdyZUGoWpMbvqHA5MZw4ppabm02Qyz8GBvL0/8wsASVW0xm3Y+5PhYEfz90lpQXdG97AoZ /tzQ02AOeLp7eJnKP/zIe+sMez7ySzubAluHZ3CsL8xYtrxf6O0oJArjOA4k1S28+zlTh5aIiJELq b2uZ3guQq9luXS2rnz4d3U2dyMC2M1lebD8l63wWox7AXf2XZ0FgL6q14dyqyK+5EkK3hNS7GkwPW wkHTxNDA==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kHme2-0005if-Uf; Mon, 14 Sep 2020 11:27:39 +0000 Date: Mon, 14 Sep 2020 12:27:38 +0100 From: Matthew Wilcox To: kernel test robot Cc: linux-mm@kvack.org, Andrew Morton , Hugh Dickins , William Kucharski , Jani Nikula , Alexey Dobriyan , Johannes Weiner , Chris Wilson , Matthew Auld , Huang Ying , intel-gfx@lists.freedesktop.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, lkp@lists.01.org Subject: Re: [mm] 2037ab69a5: BUG:KASAN:null-ptr-deref_in_t Message-ID: <20200914112738.GM6583@casper.infradead.org> References: <20200910183318.20139-7-willy@infradead.org> <20200914085545.GB28738@shao2-debian> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200914085545.GB28738@shao2-debian> X-Rspamd-Queue-Id: 5D67510254804 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Sep 14, 2020 at 04:55:45PM +0800, kernel test robot wrote: > Greeting, > > FYI, we noticed the following commit (built with gcc-9): > > commit: 2037ab69a5cd8afe58347135010f6160ea368dd0 ("mm: Convert find_get_entry to return the head page") Thank you! diff --git a/mm/swap_state.c b/mm/swap_state.c index c2fb62f660a5..a22c2430e80c 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -427,6 +427,8 @@ struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index) struct swap_info_struct *si; struct page *page = find_get_entry(mapping, index); + if (!page) + return page; if (!xa_is_value(page)) return find_subpage(page, index); if (!shmem_mapping(mapping))