linux-kernel - [PATCH AUTOSEL 6.5 5/7] virtio-blk: fix implicit overflow on virtio_max_dma

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Message-ID: <20231112132347.174334-5-sashal@kernel.org>
Date:   Sun, 12 Nov 2023 08:23:37 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     zhenwei pi <pizhenwei@...edance.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Sasha Levin <sashal@...nel.org>, jasowang@...hat.com,
        axboe@...nel.dk, virtualization@...ts.linux.dev,
        linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 6.5 5/7] virtio-blk: fix implicit overflow on virtio_max_dma_size

From: zhenwei pi <pizhenwei@...edance.com>

[ 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 <pizhenwei@...edance.com>
Message-Id: <20230904061045.510460-1-pizhenwei@...edance.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 1fe011676d070..4a4b9bad551e8 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -1313,6 +1313,7 @@ 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",
@@ -1411,7 +1412,8 @@ static int virtblk_probe(struct virtio_device *vdev)
 	/* No real sector limit. */
 	blk_queue_max_hw_sectors(q, UINT_MAX);
 
-	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