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[2620:137:e000::1:20]) by mx.google.com with ESMTP id u29-20020a50951d000000b0045cba2d74c3si7893859eda.541.2022.11.14.10.41.00; Mon, 14 Nov 2022 10:41:24 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=swj2BFaQ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236951AbiKNSaT (ORCPT + 99 others); Mon, 14 Nov 2022 13:30:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236900AbiKNSaQ (ORCPT ); Mon, 14 Nov 2022 13:30:16 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E511A2BB35 for ; Mon, 14 Nov 2022 10:30:07 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 93279B8114B for ; Mon, 14 Nov 2022 18:30:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3E15C433C1; Mon, 14 Nov 2022 18:30:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668450605; bh=xilSGlQYchsVmmKikIJMaS8XjvWaQ2LB9bIwb65/qKU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=swj2BFaQreATJBLs249o+BEvmHBNmuMldNlErlB/B8b9dA22U3sLrY9JShtl3euSQ LUc6YwbdvRPS2ozuIqEQEBnl0d69Is6VtnYjjY9at5mu9FXSttoIGplB/W7oT1oETx Bg5vWylJKHenAihciGdnpQLmqsR40s7x4mCjxqZzarjbfJAhtbKOh3HvWpLRiufxuf swEFNl8tFd4BuigWfcY2gMP5XJhOtmtc1aftM+cJkC2hGYAE6ag8mqW8UZW3eWp4cW 08HZe+AKn82IERaTJkXuoH6QLoQHIl9gbSUgUOtkzK/ZDCz5xXKMUIZZvT6toGxT7K rIhOCkkEEzaKA== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH mm-unstable 1/2] mm/damon/sysfs-schemes: skip tried regions update if the scheme directory has removed Date: Mon, 14 Nov 2022 18:29:53 +0000 Message-Id: <20221114182954.4745-2-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221114182954.4745-1-sj@kernel.org> References: <20221114182954.4745-1-sj@kernel.org> MIME-Version: 1.0 X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749497973942335712?= X-GMAIL-MSGID: =?utf-8?q?1749497973942335712?= A DAMON sysfs interface user can start DAMON with a scheme, remove the sysfs directory for the scheme, and then ask updates of the scheme's tried regions. Because the schemes tried regions update logic doesn't aware of the situation, it results in an invalid memory access. Fix the bug by checking if the scheme sysfs directory exists. Fixes: 1322c8148dfe ("mm/damon/sysfs: implement DAMOS tried regions update command") # mm-unstable Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index a79aa32d3422..4df3c99983e8 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -1231,6 +1231,11 @@ static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx, break; schemes_idx++; } + + /* user could removed the scheme sysfs dir */ + if (schemes_idx >= sysfs_schemes->nr) + return 0; + sysfs_regions = sysfs_schemes->schemes_arr[schemes_idx]->tried_regions; region = damon_sysfs_scheme_region_alloc(r); list_add_tail(®ion->list, &sysfs_regions->regions_list);