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,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 2138CC43219 for ; Sat, 4 May 2019 06:54:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F1F8F206BB for ; Sat, 4 May 2019 06:54:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727094AbfEDGy4 (ORCPT ); Sat, 4 May 2019 02:54:56 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:43158 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726969AbfEDGyy (ORCPT ); Sat, 4 May 2019 02:54:54 -0400 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 208E47543CC32401C728; Sat, 4 May 2019 14:54:51 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.439.0; Sat, 4 May 2019 14:54:43 +0800 From: Wei Yongjun To: Frederic Barrat , Andrew Donnellan , Arnd Bergmann , Greg Kroah-Hartman , Alastair D'Silva CC: Wei Yongjun , , , Subject: [PATCH -next] ocxl: Fix return value check in afu_ioctl() Date: Sat, 4 May 2019 07:04:30 +0000 Message-ID: <20190504070430.57008-1-weiyongjun1@huawei.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In case of error, the function eventfd_ctx_fdget() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). This issue was detected by using the Coccinelle software. Fixes: 060146614643 ("ocxl: move event_fd handling to frontend") Signed-off-by: Wei Yongjun --- drivers/misc/ocxl/file.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c index 8aa22893ed76..2870c25da166 100644 --- a/drivers/misc/ocxl/file.c +++ b/drivers/misc/ocxl/file.c @@ -257,8 +257,8 @@ static long afu_ioctl(struct file *file, unsigned int cmd, return -EINVAL; irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset); ev_ctx = eventfd_ctx_fdget(irq_fd.eventfd); - if (!ev_ctx) - return -EFAULT; + if (IS_ERR(ev_ctx)) + return PTR_ERR(ev_ctx); rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx); break;