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| author | Honggyu Kim <honggyu.kim@sk.com> | 2025-07-02 03:02:04 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-07-10 07:07:55 +0300 |
| commit | bd225b9591442065beb876da72656f4a2d627d03 (patch) | |
| tree | ed3d351bbec8bf8869badf63f8a31b9578e7defc /drivers/pci/controller/pci-host-common.c | |
| parent | ddba1b6cf4791824f8b614ff8878353a6c6f79f5 (diff) | |
| download | linux-bd225b9591442065beb876da72656f4a2d627d03.tar.xz | |
mm/damon: fix divide by zero in damon_get_intervals_score()
The current implementation allows having zero size regions with no special
reasons, but damon_get_intervals_score() gets crashed by divide by zero
when the region size is zero.
[ 29.403950] Oops: divide error: 0000 [#1] SMP NOPTI
This patch fixes the bug, but does not disallow zero size regions to keep
the backward compatibility since disallowing zero size regions might be a
breaking change for some users.
In addition, the same crash can happen when intervals_goal.access_bp is
zero so this should be fixed in stable trees as well.
Link: https://lkml.kernel.org/r/20250702000205.1921-5-honggyu.kim@sk.com
Fixes: f04b0fedbe71 ("mm/damon/core: implement intervals auto-tuning")
Signed-off-by: Honggyu Kim <honggyu.kim@sk.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/pci/controller/pci-host-common.c')
0 files changed, 0 insertions, 0 deletions