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 37460C072DD for ; Sun, 12 Nov 2023 13:25:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231776AbjKLNZd (ORCPT ); Sun, 12 Nov 2023 08:25:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56386 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231684AbjKLNZJ (ORCPT ); Sun, 12 Nov 2023 08:25:09 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 976A44EEA; Sun, 12 Nov 2023 05:24:38 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 772E5C433BC; Sun, 12 Nov 2023 13:24:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699795478; bh=lMxgzkyq2IcTJHsewfFDozAFajBZzVRz4hG3yP0Tjpc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ePuys/dxFOA67ikj+6gTPNls66j9J/032mVTVtL8rwLY6LgyubYEhKdocIuiV20UP FX4qfF6asO7rRsHrRIwVlfSPUO8bpF92EwHp95/BfRVg8YnxdGWCaXqjbh+Ol5yqHE dmbKv3Fdyg6Thol1Kq1ShEHgO1GhwxI9C9rZEpWSBxGWoeC3K2y8jSxsgIJ/SzcwRr oDIcgEtv8SQUiELJNgSt4RLZFe2dY6wjYEr/DKbaTtmnMqLLJGEUNJAhQVBHlf4H7P prtflBIOaNltfHp4pg4Gys245q0Azy7lFH75rtrX12GMm+sliBwiF5fELOU0DjTLqI mma9JsQEQBtPA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: zhenwei pi , "Michael S . Tsirkin" , Sasha Levin , jasowang@redhat.com, axboe@kernel.dk, virtualization@lists.linux.dev, linux-block@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 3/4] virtio-blk: fix implicit overflow on virtio_max_dma_size Date: Sun, 12 Nov 2023 08:24:23 -0500 Message-ID: <20231112132432.174680-3-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231112132432.174680-1-sashal@kernel.org> References: <20231112132432.174680-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.138 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: zhenwei pi [ Upstream commit fafb51a67fb883eb2dde352539df939a251851be ] The following codes have an implicit conversion from size_t to u32: (u32)max_size = (size_t)virtio_max_dma_size(vdev); This may lead overflow, Ex (size_t)4G -> (u32)0. Once virtio_max_dma_size() has a larger size than U32_MAX, use U32_MAX instead. Signed-off-by: zhenwei pi Message-Id: <20230904061045.510460-1-pizhenwei@bytedance.com> Signed-off-by: Michael S. Tsirkin Signed-off-by: Sasha Levin --- drivers/block/virtio_blk.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index d2ba849bb8d19..affeca0dbc7ea 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -743,6 +743,7 @@ static int virtblk_probe(struct virtio_device *vdev) u16 min_io_size; u8 physical_block_exp, alignment_offset; unsigned int queue_depth; + size_t max_dma_size; if (!vdev->config->get) { dev_err(&vdev->dev, "%s failure: config access disabled\n", @@ -844,7 +845,8 @@ static int virtblk_probe(struct virtio_device *vdev) /* No real sector limit. */ blk_queue_max_hw_sectors(q, -1U); - max_size = virtio_max_dma_size(vdev); + max_dma_size = virtio_max_dma_size(vdev); + max_size = max_dma_size > U32_MAX ? U32_MAX : max_dma_size; /* Host can optionally specify maximum segment size and number of * segments. */ -- 2.42.0