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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDC7DC43334 for ; Sun, 5 Jun 2022 03:47:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348462AbiFEDr1 (ORCPT ); Sat, 4 Jun 2022 23:47:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58024 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343800AbiFEDrI (ORCPT ); Sat, 4 Jun 2022 23:47:08 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3992C63 for ; Sat, 4 Jun 2022 20:46:56 -0700 (PDT) Received: from dggpemm500022.china.huawei.com (unknown [172.30.72.57]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4LG2ZG1vWCzgYYt; Sun, 5 Jun 2022 11:45:10 +0800 (CST) Received: from dggpemm500002.china.huawei.com (7.185.36.229) by dggpemm500022.china.huawei.com (7.185.36.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Sun, 5 Jun 2022 11:46:55 +0800 Received: from localhost.localdomain (10.175.112.125) by dggpemm500002.china.huawei.com (7.185.36.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Sun, 5 Jun 2022 11:46:54 +0800 From: Chen Wandun To: , , , , , , Subject: [PATCH v2 2/3] mm/shmem: return error code directly for invalid addr Date: Sun, 5 Jun 2022 11:55:56 +0800 Message-ID: <20220605035557.3957759-3-chenwandun@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220605035557.3957759-1-chenwandun@huawei.com> References: <20220605035557.3957759-1-chenwandun@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500002.china.huawei.com (7.185.36.229) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return error code directly for addr is not PAGE_SIZE aligned or beyond TASK_SIZE, no need to check these cases in caller. Signed-off-by: Chen Wandun --- mm/shmem.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index 17f8297ece29..5e61692f2d8e 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2142,10 +2142,10 @@ unsigned long shmem_get_unmapped_area(struct file *file, return addr; if (IS_ERR_VALUE(addr)) return addr; - if (addr & ~PAGE_MASK) - return addr; + if (offset_in_page(addr)) + return -EINVAL; if (addr > TASK_SIZE - len) - return addr; + return -ENOMEM; if (shmem_huge == SHMEM_HUGE_DENY) return addr; @@ -2196,7 +2196,7 @@ unsigned long shmem_get_unmapped_area(struct file *file, inflated_addr = get_area(NULL, uaddr, inflated_len, 0, flags); if (IS_ERR_VALUE(inflated_addr)) return addr; - if (inflated_addr & ~PAGE_MASK) + if (offset_in_page(inflated_addr)) return addr; inflated_offset = inflated_addr & (HPAGE_PMD_SIZE-1); -- 2.25.1