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| author |   Miaohe Lin <linmiaohe@huawei.com> | 2022-06-09 21:08:35 +0800 |
|---|---|---|
| committer |   akpm <akpm@linux-foundation.org> | 2022-06-16 19:48:30 -0700 |
| commit | ed913b055a74b723976f8e885a3395162a0371e6 (patch) | |
| tree | f072fe1621a6904e3e78a851f9fce5134d365f49 /mm/memblock.c | |
| parent | mm/memremap: fix wrong function name above memremap_pages() (diff) | |
| download | linux-dev-ed913b055a74b723976f8e885a3395162a0371e6.tar.xz linux-dev-ed913b055a74b723976f8e885a3395162a0371e6.zip | |
lib/test_hmm: avoid accessing uninitialized pages
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: b659baea7546 ("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>
Diffstat (limited to 'mm/memblock.c')
0 files changed, 0 insertions, 0 deletions