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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 31605C4361B for ; Mon, 14 Dec 2020 12:31:44 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 86A55249C1 for ; Mon, 14 Dec 2020 12:31:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 86A55249C1 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:40604 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kon0w-00035I-8d for qemu-devel@archiver.kernel.org; Mon, 14 Dec 2020 07:31:42 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:43572) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1komzZ-0002Or-2I; Mon, 14 Dec 2020 07:30:17 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:2993) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1komzV-0000dn-4o; Mon, 14 Dec 2020 07:30:16 -0500 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4CvggQ4YPtzhtTn; Mon, 14 Dec 2020 20:29:22 +0800 (CST) Received: from huawei.com (10.175.124.27) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.498.0; Mon, 14 Dec 2020 20:29:50 +0800 From: Alex Chen To: , Subject: [PATCH] virtiofsd: Remove useless code about send_notify_iov Date: Mon, 14 Dec 2020 12:16:15 +0000 Message-ID: <20201214121615.29967-1-alex.chen@huawei.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.175.124.27] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.191; envelope-from=alex.chen@huawei.com; helo=szxga05-in.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alex.chen@huawei.com, qemu-trivial@nongnu.org, qemu-devel@nongnu.org, zhang.zhanghailiang@huawei.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The 'ch' will be NULL in the following stack: send_notify_iov()->fuse_send_msg()->virtio_send_msg(), and this may lead to NULL pointer dereferenced in virtio_send_msg(). But send_notify_iov() was never called, so remove the useless code about send_notify_iov() to fix this problem. Signed-off-by: Alex Chen --- tools/virtiofsd/fuse_lowlevel.c | 98 --------------------------------- 1 file changed, 98 deletions(-) diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c index d4119e92ab..e94b71110b 100644 --- a/tools/virtiofsd/fuse_lowlevel.c +++ b/tools/virtiofsd/fuse_lowlevel.c @@ -2143,104 +2143,6 @@ static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, send_reply_ok(req, NULL, 0); } -static int send_notify_iov(struct fuse_session *se, int notify_code, - struct iovec *iov, int count) -{ - struct fuse_out_header out = { - .error = notify_code, - }; - - if (!se->got_init) { - return -ENOTCONN; - } - - iov[0].iov_base = &out; - iov[0].iov_len = sizeof(struct fuse_out_header); - - return fuse_send_msg(se, NULL, iov, count); -} - -int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph) -{ - if (ph != NULL) { - struct fuse_notify_poll_wakeup_out outarg = { - .kh = ph->kh, - }; - struct iovec iov[2]; - - iov[1].iov_base = &outarg; - iov[1].iov_len = sizeof(outarg); - - return send_notify_iov(ph->se, FUSE_NOTIFY_POLL, iov, 2); - } else { - return 0; - } -} - -int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino, - off_t off, off_t len) -{ - struct fuse_notify_inval_inode_out outarg = { - .ino = ino, - .off = off, - .len = len, - }; - struct iovec iov[2]; - - if (!se) { - return -EINVAL; - } - - iov[1].iov_base = &outarg; - iov[1].iov_len = sizeof(outarg); - - return send_notify_iov(se, FUSE_NOTIFY_INVAL_INODE, iov, 2); -} - -int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent, - const char *name, size_t namelen) -{ - struct fuse_notify_inval_entry_out outarg = { - .parent = parent, - .namelen = namelen, - }; - struct iovec iov[3]; - - if (!se) { - return -EINVAL; - } - - iov[1].iov_base = &outarg; - iov[1].iov_len = sizeof(outarg); - iov[2].iov_base = (void *)name; - iov[2].iov_len = namelen + 1; - - return send_notify_iov(se, FUSE_NOTIFY_INVAL_ENTRY, iov, 3); -} - -int fuse_lowlevel_notify_delete(struct fuse_session *se, fuse_ino_t parent, - fuse_ino_t child, const char *name, - size_t namelen) -{ - struct fuse_notify_delete_out outarg = { - .parent = parent, - .child = child, - .namelen = namelen, - }; - struct iovec iov[3]; - - if (!se) { - return -EINVAL; - } - - iov[1].iov_base = &outarg; - iov[1].iov_len = sizeof(outarg); - iov[2].iov_base = (void *)name; - iov[2].iov_len = namelen + 1; - - return send_notify_iov(se, FUSE_NOTIFY_DELETE, iov, 3); -} - int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_t ino, off_t offset, struct fuse_bufvec *bufv) { -- 2.19.1