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Message-ID: <20231019055134-mutt-send-email-mst@kernel.org>
Date: Thu, 19 Oct 2023 05:52:15 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: zhenwei pi <pizhenwei@...edance.com>
Cc: jasowang@...hat.com, xuanzhuo@...ux.alibaba.com,
virtualization@...ts.linux-foundation.org, axboe@...nel.dk,
linux-kernel@...r.kernel.org
Subject: Re: PING: [PATCH] virtio-blk: fix implicit overflow on
virtio_max_dma_size
On Thu, Oct 19, 2023 at 05:43:55PM +0800, zhenwei pi wrote:
> Hi Michael,
>
> This seems to have been ignored as you suggested.
>
> LINK: https://www.spinics.net/lists/linux-virtualization/msg63015.html
Pls Cc more widely then:
Paolo Bonzini <pbonzini@...hat.com> (reviewer:VIRTIO BLOCK AND SCSI DRIVERS)
Stefan Hajnoczi <stefanha@...hat.com> (reviewer:VIRTIO BLOCK AND SCSI DRIVERS)
Xuan Zhuo <xuanzhuo@...ux.alibaba.com> (reviewer:VIRTIO CORE AND NET DRIVERS)
Jens Axboe <axboe@...nel.dk> (maintainer:BLOCK LAYER)
linux-block@...r.kernel.org (open list:BLOCK LAYER)
would all be good people to ask to review this.
> On 9/4/23 14:10, zhenwei pi wrote:
> > 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>
> > ---
> > 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 1fe011676d07..4a4b9bad551e 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. */
>
> --
> zhenwei pi
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