From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 615881AED5C; Tue, 18 Jun 2024 12:42:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718714541; cv=none; b=g0Z5zDC2Y8JyfPZHsbRfGFMquyJLA9JXfIKuOlnTsUxUPX5mrzcqw/YXNNJkoVsbA1V/kXRqlM+D+62Fv3awhTkvc9VrPUHUwi20Qn7wZPRnS/XdPNHG5/hTL8LwRRYeuur6FdhuigjaGfbUlob9lIMqbvfMAwZXoq7QL8zS2JQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718714541; c=relaxed/simple; bh=D448ZoV/9zsFaLm4hdJ2TqO6XtuiHJ0fgi3i1hWjrvU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=W9Ct82fdamFpWeyE6XMTcyz28AaDsVxyoieLlmCMVp02TzmAMWzJ+hW6FO/iloxIbcPIC0Oq3mB/xKlDFz3C17yCVUR1BJr58GNHDvF/eHvoD3v80AiMpevcfI6kZTnUkXwybhhzQI16dU3snw/lmhJE5qZSSVL35iAbeiuBDbU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mCUfOaMY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mCUfOaMY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C8ECC3277B; Tue, 18 Jun 2024 12:42:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1718714541; bh=D448ZoV/9zsFaLm4hdJ2TqO6XtuiHJ0fgi3i1hWjrvU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mCUfOaMYk1JhHTQuy8K3sGa5dPCoIzDjChl7wZP93r7NmczSB6OkV1l4qiPtLFZRP LZTQQsaEhQgZsyAwhFA8k1ToE7Z3LmT/t+HzT3o0+WIZiW9gS/S30zITsciyQiYYJP 1b4ZruOlkS0YjYLnntrqsas4z2KtX4sAvm2RFF/MhjVF3wtaCqCb+b981TZe2ozKs5 OwXqdQX4TU/k+M4lPywi+4gM2vJQmBia9+lt6u6b2ajTT9EDENPR3Jb6dJNNO8TT4w fJMpvdEKbdQL4yUpvjglrZZEapT67UaVhnEsP2v3TChDsTQNP9PGyyJGj1X5LV5+/N GsVYPV3Yl/TVg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andreas Hindborg , Ming Lei , Jens Axboe , Sasha Levin , dlemoal@kernel.org, hare@suse.de, kch@nvidia.com, johannes.thumshirn@wdc.com, zhouchengming@bytedance.com, yanjun.zhu@linux.dev, yukuai3@huawei.com, shinichiro.kawasaki@wdc.com, linux-block@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 19/21] null_blk: fix validation of block size Date: Tue, 18 Jun 2024 08:41:18 -0400 Message-ID: <20240618124139.3303801-19-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240618124139.3303801-1-sashal@kernel.org> References: <20240618124139.3303801-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.161 Content-Transfer-Encoding: 8bit From: Andreas Hindborg [ Upstream commit c462ecd659b5fce731f1d592285832fd6ad54053 ] Block size should be between 512 and PAGE_SIZE and be a power of 2. The current check does not validate this, so update the check. Without this patch, null_blk would Oops due to a null pointer deref when loaded with bs=1536 [1]. Link: https://lore.kernel.org/all/87wmn8mocd.fsf@metaspace.dk/ Signed-off-by: Andreas Hindborg Reviewed-by: Ming Lei Link: https://lore.kernel.org/r/20240603192645.977968-1-nmi@metaspace.dk [axboe: remove unnecessary braces and != 0 check] Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/null_blk/main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index 87791265e09bf..ad0172f3fd4da 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -1749,8 +1749,8 @@ static int null_validate_conf(struct nullb_device *dev) return -EINVAL; } - dev->blocksize = round_down(dev->blocksize, 512); - dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096); + if (blk_validate_block_size(dev->blocksize)) + return -EINVAL; if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) { if (dev->submit_queues != nr_online_nodes) -- 2.43.0