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d35963bfb0
linux/mm/damon
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SeongJae Park d35963bfb0 mm/damon/core: avoid divide-by-zero during monitoring results update 
When monitoring attributes are changed, DAMON updates access rate of the
monitoring results accordingly.  For that, it 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/20231019194924.100347-3-sj@kernel.org
Fixes: 2f5bef5a59 ("mm/damon/core: update monitoring results for new monitoring attributes")
Signed-off-by: SeongJae Park <sj@kernel.org>
Reported-by: Jakub Acs <acsjakub@amazon.de>
Cc: <stable@vger.kernel.org>	[6.3+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-10-25 16:47:15 -07:00
..
core-test.h mm/damon/core-test: fix memory leak in damon_new_ctx() 2023-10-04 10:32:32 -07:00
core.c mm/damon/core: avoid divide-by-zero during monitoring results update 2023-10-25 16:47:15 -07:00
dbgfs-test.h mm/damon/dbgfs-test: fix is_target_id() change 2022-03-22 15:57:12 -07:00
dbgfs.c mm/damon/core: implement scheme-specific apply interval 2023-10-04 10:32:31 -07:00
Kconfig mm/damon/Kconfig: add DAMON debugfs interface deprecation notice 2023-02-13 15:54:32 -08:00
lru_sort.c mm/damon/core: implement scheme-specific apply interval 2023-10-04 10:32:31 -07:00
Makefile mm/damon/modules: deduplicate init steps for DAMON context setup 2022-11-30 15:01:26 -08:00
modules-common.c mm/damon/modules: deduplicate init steps for DAMON context setup 2022-11-30 15:01:26 -08:00
modules-common.h mm/damon/modules: deduplicate init steps for DAMON context setup 2022-11-30 15:01:26 -08:00
ops-common.c damon: use pmdp_get instead of drectly dereferencing pmd 2023-08-21 13:37:30 -07:00
ops-common.h mm/damon/ops-common: atomically test and clear young on ptes and pmds 2023-06-09 16:25:55 -07:00
paddr.c mm/damon/core: use pseudo-moving sum for nr_accesses_bp 2023-10-04 10:32:30 -07:00
reclaim.c mm/damon/core: implement scheme-specific apply interval 2023-10-04 10:32:31 -07:00
sysfs-common.c mm/damon/sysfs: make kobj_type structures constant 2023-02-09 16:51:45 -08:00
sysfs-common.h mm/damon/sysfs: avoid empty scheme tried regions for large apply interval 2023-10-18 14:34:19 -07:00
sysfs-schemes.c mm/damon/sysfs: avoid empty scheme tried regions for large apply interval 2023-10-18 14:34:19 -07:00
sysfs.c mm/damon/sysfs: avoid empty scheme tried regions for large apply interval 2023-10-18 14:34:19 -07:00
vaddr-test.h mm/damon/vaddr-test: fix memory leak in damon_do_test_apply_three_regions() 2023-09-29 17:20:47 -07:00
vaddr.c mm/damon/core: use pseudo-moving sum for nr_accesses_bp 2023-10-04 10:32:30 -07:00