From nobody Tue Jun 23 09:11:13 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1070FC433F5 for ; Tue, 8 Mar 2022 07:57:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344700AbiCHH63 (ORCPT ); Tue, 8 Mar 2022 02:58:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237428AbiCHH6Y (ORCPT ); Tue, 8 Mar 2022 02:58:24 -0500 Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8776BBF3; Mon, 7 Mar 2022 23:57:27 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R381e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04407;MF=jiapeng.chong@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0V6dZ1Bq_1646726239; Received: from localhost(mailfrom:jiapeng.chong@linux.alibaba.com fp:SMTPD_---0V6dZ1Bq_1646726239) by smtp.aliyun-inc.com(127.0.0.1); Tue, 08 Mar 2022 15:57:25 +0800 From: Jiapeng Chong To: axboe@kernel.dk Cc: asml.silence@gmail.com, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, Jiapeng Chong , Abaci Robot Subject: [PATCH] io_uring: Fix an unsigned subtraction which can never be negative. Date: Tue, 8 Mar 2022 15:57:17 +0800 Message-Id: <20220308075717.37734-1-jiapeng.chong@linux.alibaba.com> X-Mailer: git-send-email 2.20.1.7.g153144c MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Eliminate the follow smatch warnings: fs/io_uring.c:10358 __do_sys_io_uring_enter() warn: unsigned 'fd' is never less than zero. Reported-by: Abaci Robot Signed-off-by: Jiapeng Chong --- fs/io_uring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 23e7f93d3956..d970c94804db 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -10355,7 +10355,7 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u= 32, to_submit, if (!tctx) return -EINVAL; if (fd !=3D tctx->last_reg_fd) { - if (fd < 0 || fd >=3D IO_RINGFD_REG_MAX || !tctx) + if (fd >=3D IO_RINGFD_REG_MAX || !tctx) return -EINVAL; tctx->last_reg_fd =3D array_index_nospec(fd, IO_RINGFD_REG_MAX); --=20 2.20.1.7.g153144c