From patchwork Mon Apr 29 06:13:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: luanshi X-Patchwork-Id: 10921243 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9FFC61398 for ; Mon, 29 Apr 2019 06:13:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 86D0A28703 for ; Mon, 29 Apr 2019 06:13:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7A3A328706; Mon, 29 Apr 2019 06:13:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EA4D728703 for ; Mon, 29 Apr 2019 06:13:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727202AbfD2GNu (ORCPT ); Mon, 29 Apr 2019 02:13:50 -0400 Received: from out30-132.freemail.mail.aliyun.com ([115.124.30.132]:60185 "EHLO out30-132.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726566AbfD2GNu (ORCPT ); Mon, 29 Apr 2019 02:13:50 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07487;MF=zhangliguang@linux.alibaba.com;NM=1;PH=DS;RN=2;SR=0;TI=SMTPD_---0TQTtHYW_1556518419; Received: from localhost(mailfrom:zhangliguang@linux.alibaba.com fp:SMTPD_---0TQTtHYW_1556518419) by smtp.aliyun-inc.com(127.0.0.1); Mon, 29 Apr 2019 14:13:47 +0800 From: zhangliguang To: Miklos Szeredi Cc: linux-fsdevel@vger.kernel.org Subject: [PATCH] fuse: fix a NULL pointer dereference Date: Mon, 29 Apr 2019 14:13:39 +0800 Message-Id: <1556518419-17986-1-git-send-email-zhangliguang@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In case kzalloc fails, the fix returns NULL to avoid NULL pointer dereference. Signed-off-by: zhangliguang --- fs/fuse/dev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 9971a35..23e73d8 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -61,6 +61,9 @@ static struct page **fuse_req_pages_alloc(unsigned int npages, gfp_t flags, pages = kzalloc(npages * (sizeof(struct page *) + sizeof(struct fuse_page_desc)), flags); + if (!pages) + return NULL; + *desc = (void *) pages + npages * sizeof(struct page *); return pages;