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iommufd/selftest: Fix iommufd_test_dirty() to handle <u8 bitmaps

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[ Upstream commit 9560393b83 ]

The calculation returns 0 if it sets less than the number of bits per
byte. For calculating memory allocation from bits, lets round it up to
one byte.

Link: https://lore.kernel.org/r/20240627110105.62325-3-joao.m.martins@oracle.com
Reported-by: Matt Ochs <mochs@nvidia.com>
Fixes: a9af47e382 ("iommufd/selftest: Test IOMMU_HWPT_GET_DIRTY_BITMAP")
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Matt Ochs <mochs@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Joao Martins
2024-08-03 09:00:13 +02:00
committed by Greg Kroah-Hartman
parent 2355c53217
commit 73dc9fb2b3
1 changed files with 1 additions and 1 deletions
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drivers/iommu/iommufd/selftest.c
+1 -1
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@@ -1334,7 +1334,7 @@ static int iommufd_test_dirty(struct iommufd_ucmd *ucmd, unsigned int mockpt_id,
}
max = length / page_size;
bitmap_size = max / BITS_PER_BYTE;
bitmap_size = DIV_ROUND_UP(max, BITS_PER_BYTE);
tmp = kvzalloc(bitmap_size, GFP_KERNEL_ACCOUNT);
if (!tmp) {