diff options
| author | SeongJae Park | 2023-10-19 19:49:22 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-11-28 17:07:09 +0000 |
| commit | 834a800c58ea494483d63aa077debfef3ac7199f (patch) | |
| tree | 2085789d6887b4a72e8c6275c58063ae609737c9 /io_uring/filetable.h | |
| parent | 2b38f0dbe8ba12da6985646921d531dce9b3489b (diff) | |
mm/damon/ops-common: avoid divide-by-zero during region hotness calculation
commit 3bafc47d3c4a2fc4d3b382aeb3c087f8fc84d9fd upstream.
When calculating the hotness of each region for the under-quota regions
prioritization, DAMON divides some values by the maximum nr_accesses.
However, due to the type of the related variables, simple division-based
calculation of the divisor can return zero. As a result, divide-by-zero
is possible. Fix it by using damon_max_nr_accesses(), which handles the
case.
Link: https://lkml.kernel.org/r/20231019194924.100347-4-sj@kernel.org
Fixes: 198f0f4c58b9 ("mm/damon/vaddr,paddr: support pageout prioritization")
Signed-off-by: SeongJae Park <sj@kernel.org>
Reported-by: Jakub Acs <acsjakub@amazon.de>
Cc: <stable@vger.kernel.org> [5.16+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'io_uring/filetable.h')
0 files changed, 0 insertions, 0 deletions