diff options
| author | Miaohe Lin <linmiaohe@huawei.com> | 2021-07-01 04:50:27 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-01 06:47:28 +0300 |
| commit | 014284a0815f6b9a6e10c8d575d37a5357ce033d (patch) | |
| tree | 7c6bcfdf892c9c32c5db5f19f141e6d87d305804 /mm/rodata_test.c | |
| parent | e3c0db4fec46b46a0c22b46bb55392b36ec940fc (diff) | |
| download | linux-014284a0815f6b9a6e10c8d575d37a5357ce033d.tar.xz | |
mm/z3fold: avoid possible underflow in z3fold_alloc()
It is not enough to just make sure the z3fold header is not larger than
the page size. When z3fold header is equal to PAGE_SIZE, we would
underflow when check alloc size against PAGE_SIZE - ZHDR_SIZE_ALIGNED -
CHUNK_SIZE in z3fold_alloc(). Make sure there has remaining spaces for
its buddy to fix this theoretical issue.
Link: https://lkml.kernel.org/r/20210619093151.1492174-3-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Hillf Danton <hdanton@sina.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rodata_test.c')
0 files changed, 0 insertions, 0 deletions