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lib/test_hmm: avoid accessing uninitialized pages
[ Upstream commit ed913b0 ] If make_device_exclusive_range() fails or returns pages marked for exclusive access less than required, remaining fields of pages will left uninitialized. So dmirror_atomic_map() will access those yet uninitialized fields of pages. To fix it, do dmirror_atomic_map() iff all pages are marked for exclusive access (we will break if mapped is less than required anyway) so we won't access those uninitialized fields of pages. Link: https://lkml.kernel.org/r/20220609130835.35110-1-linmiaohe@huawei.com Fixes: b659bae ("mm: selftests for exclusive device memory") Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Ralph Campbell <rcampbell@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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