This is a note to let you know that I've just added the patch titled
mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-damon-sysfs-schemes-handle-tried-regions-sysfs-directory-allocation-failure.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 84055688b6bc075c92a88e2d6c3ad26ab93919f9 Mon Sep 17 00:00:00 2001
From: SeongJae Park <sj@xxxxxxxxxx>
Date: Mon, 6 Nov 2023 23:34:07 +0000
Subject: mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure
From: SeongJae Park <sj@xxxxxxxxxx>
commit 84055688b6bc075c92a88e2d6c3ad26ab93919f9 upstream.
DAMOS tried regions sysfs directory allocation function
(damon_sysfs_scheme_regions_alloc()) is not handling the memory allocation
failure. In the case, the code will dereference NULL pointer. Handle the
failure to avoid such invalid access.
Link: https://lkml.kernel.org/r/20231106233408.51159-3-sj@xxxxxxxxxx
Fixes: 9277d0367ba1 ("mm/damon/sysfs-schemes: implement scheme region directory")
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [6.2+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/damon/sysfs-schemes.c | 3 +++
1 file changed, 3 insertions(+)
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -125,6 +125,9 @@ damon_sysfs_scheme_regions_alloc(void)
struct damon_sysfs_scheme_regions *regions = kmalloc(sizeof(*regions),
GFP_KERNEL);
+ if (!regions)
+ return NULL;
+
regions->kobj = (struct kobject){};
INIT_LIST_HEAD(®ions->regions_list);
regions->nr_regions = 0;
Patches currently in stable-queue which might be from sj@xxxxxxxxxx are
queue-6.5/mm-damon-implement-a-function-for-max-nr_accesses-safe-calculation.patch
queue-6.5/mm-damon-ops-common-avoid-divide-by-zero-during-region-hotness-calculation.patch
queue-6.5/mm-damon-sysfs-check-error-from-damon_sysfs_update_target.patch
queue-6.5/mm-damon-lru_sort-avoid-divide-by-zero-in-hot-threshold-calculation.patch
queue-6.5/mm-damon-core-avoid-divide-by-zero-during-monitoring-results-update.patch
queue-6.5/mm-damon-sysfs-schemes-handle-tried-region-directory-allocation-failure.patch
queue-6.5/mm-damon-sysfs-update-monitoring-target-regions-for-online-input-commit.patch
queue-6.5/mm-damon-sysfs-schemes-handle-tried-regions-sysfs-directory-allocation-failure.patch
queue-6.5/mm-damon-sysfs-remove-requested-targets-when-online-commit-inputs.patch
