From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AFB6384CCD; Mon, 3 Aug 2026 13:40:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785764438; cv=none; b=GcMFMJpH1b3lp9OJDmF51FSYIj6zyx2tD/lm+TfrchNCZUCamEdTo7x3JpLEEbQnCZwa+BCi4rp4MpPwVazV6QW3hlBPO1e3y9vLOjTubUfVr9AYnZzUE65ejUo0FLpXpFE3Aii7aMAtH91VTT2n9d9JBRspwq2VVmqfXo8ZdXM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785764438; c=relaxed/simple; bh=UkC3QHHr5h4Uw7AKIK+r2Udi37d++Q6AMPqSLoBAEUs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=mcAO+rHZzlPUt2flN2oj2RWASOvFj2LS6uSq27YToKbmQQAFP5Dd5FbiPKSRSQ5BwAJ4UmJXP1gUHAio9k0bBzKLhmbtDmu5YCieK9y6PZ4/ABFu2twVvHjFiXKVGD0HvDavd7nhAwP5nRslURC3V3PepzUIO0YKvROi6XGIKEc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YAGpRqNd; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YAGpRqNd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E85D61F000E9; Mon, 3 Aug 2026 13:40:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785764437; bh=3grEtyvv7HjTLXQt7Y4dNymnDB9y7Wt+YYyBTBraHmg=; h=From:To:Cc:Subject:Date; b=YAGpRqNd6WrF813XPCqZqeEcUR2QAnZUs2khd/cjc+J/tv5Ps2keDxHV9eJzQ3SPG Yl7RSgO5/S9ndAwd81zKFJaNjrvocuim3ecUvYlSTZ3LNlovR7u7nV1iZ+l+69qKR0 /o7BRcpMpLLK5UQXHIFPXhRMVvg/nroIZQra8ei4jU5bi1WsA/6BWCh1kgbjo/NwMM 8hjhR0E+YKue41Y2TLEApRClzvKKbfGR/eO/feJTrIZYutbRrazDjiEJoni8MazCYP XcYzy3T6mRbJl8sCC75BgybNGsb/CNU0dOFvG8HbgqpEG5D20uIgkhGm7KzOgU8M7o +44VyN3xHRpvQ== From: SJ Park To: Andrew Morton Cc: SJ Park , stable@vger.kernel.org, Yunjeong Mun , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 0/2] mm/damon: avoid division by zero from damos_quota_score() Date: Mon, 3 Aug 2026 06:40:31 -0700 Message-ID: <20260803134034.15217-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit DAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division by zero in damos_quota_score(). Avoid it by adding parameters validation checks. Changes from RFC v2 - RFC v2: https://lore.kernel.org/20260802162050.89477-1-sj@kernel.org - Drop RFC tag. Changes from RFC - RFC: https://lore.kernel.org/20260801211315.2456-1-sj@kernel.org - Add a fix for DAMON_LRU_SORT. SJ Park (2): samples/damon/mtier: error out for zero quota goal target values mm/damon/lru_sort: error out for >10000 active_mem_bp mm/damon/lru_sort.c | 2 ++ samples/damon/mtier.c | 3 +++ 2 files changed, 5 insertions(+) base-commit: 3bf69d5b51b688b8f923a13b7f12eb9b1c6a284f -- 2.47.3