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uio_hv_generic: Align ring size to system page

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[ Upstream commit 0315fef2aff9f251ddef8a4b53db9187429c3553 ]

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

Cc: stable@vger.kernel.org
Fixes: 95096f2fbd ("uio-hv-generic: new userspace i/o driver for VMBus")
Signed-off-by: Long Li <longli@microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/1746492997-4599-4-git-send-email-longli@linuxonhyperv.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <1746492997-4599-4-git-send-email-longli@linuxonhyperv.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Long Li
2025-05-05 17:56:35 -07:00
committed by Greg Kroah-Hartman
parent ca0198894b
commit df1d7e879e
1 changed files with 3 additions and 0 deletions
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3
drivers/uio/uio_hv_generic.c
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@@ -260,6 +260,9 @@ hv_uio_probe(struct hv_device *dev,
if (!ring_size) if (!ring_size)
ring_size = HV_RING_SIZE * PAGE_SIZE; ring_size = HV_RING_SIZE * PAGE_SIZE;
/* Adjust ring size if necessary to have it page aligned */
ring_size = VMBUS_RING_SIZE(ring_size);
pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL); pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL);
if (!pdata) if (!pdata)
return -ENOMEM; return -ENOMEM;