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=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,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 9C95CC28EBD for ; Sun, 9 Jun 2019 17:05:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 689692084A for ; Sun, 9 Jun 2019 17:05:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099921; bh=j/4mj41txbokL6sWtov/J2R9lrvZFfKMACDs23RHENM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pP4SUGeLaMPev8TlPGAvzGnjtnWRozMBJIsGJph0kzu+w91/XU2uoLoebAdUCTcRg 0lEAAYYSH0IaFWHP6phnHzCA7eH8GWnBbkzaTIDKaa1ABrnz47wXQkB9LAR0K/VO4N TOoekONL1cHIjearYdy1aFsuKeddoWPTmftZei6Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388380AbfFIRFT (ORCPT ); Sun, 9 Jun 2019 13:05:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:44498 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388788AbfFIRFS (ORCPT ); Sun, 9 Jun 2019 13:05:18 -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 0374220833; Sun, 9 Jun 2019 17:05:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099918; bh=j/4mj41txbokL6sWtov/J2R9lrvZFfKMACDs23RHENM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MpZn3YoqjytMmjN3m8OQEPZhZk7zIXWZtwkXFi15kWjQD7AQaRIm1er3JQzqCg7wB zkhKzQL0ubgua82/klhfXa97bscpxswoYggs9JnYElUSqM1OfFrOURNBYBwwNRpWqI 0saOc5ba/UrcLAVDBK/o/UyO1RzPsZ5IFa9VINd0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roberto Bergantinos Corpas , Pavel Shilovsky , Steve French Subject: [PATCH 4.4 213/241] CIFS: cifs_read_allocate_pages: dont iterate through whole page array on ENOMEM Date: Sun, 9 Jun 2019 18:42:35 +0200 Message-Id: <20190609164154.817633029@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190609164147.729157653@linuxfoundation.org> References: <20190609164147.729157653@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Roberto Bergantinos Corpas commit 31fad7d41e73731f05b8053d17078638cf850fa6 upstream. In cifs_read_allocate_pages, in case of ENOMEM, we go through whole rdata->pages array but we have failed the allocation before nr_pages, therefore we may end up calling put_page with NULL pointer, causing oops Signed-off-by: Roberto Bergantinos Corpas Acked-by: Pavel Shilovsky Signed-off-by: Steve French CC: Stable Signed-off-by: Greg Kroah-Hartman --- fs/cifs/file.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2829,7 +2829,9 @@ cifs_read_allocate_pages(struct cifs_rea } if (rc) { - for (i = 0; i < nr_pages; i++) { + unsigned int nr_page_failed = i; + + for (i = 0; i < nr_page_failed; i++) { put_page(rdata->pages[i]); rdata->pages[i] = NULL; }