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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY, 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 15932C43219 for ; Mon, 29 Apr 2019 06:13:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8AB021473 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 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; -- 1.8.3.1