From: longli@linuxonhyperv.com longli@linuxonhyperv.com Sent: Wednesday, April 30, 2025 3:06 PM

Following the ring header, the ring data should align to system page boundary. Adjust the size if necessary.

Cc: stable@vger.kernel.org Fixes: 95096f2fbd10 ("uio-hv-generic: new userspace i/o driver for VMBus") Signed-off-by: Long Li longli@microsoft.com

---

drivers/uio/uio_hv_generic.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index 08385b04c4ab..dfc5f0e1a254 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -256,6 +256,12 @@ hv_uio_probe(struct hv_device *dev, if (!ring_size) ring_size = SZ_2M;

• /*

• * Adjust ring size if necessary to have the ring data region page
  

• * aligned
  

• */
  

• ring_size = VMBUS_RING_SIZE(ring_size);
• pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM;

-- 2.34.1

Reviewed-by: Michael Kelley mhklinux@outlook.com