The patch titled Subject: mm/damon/core: initialize damo_filter->list from damos_new_filter() has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-damon-core-initialize-damo_filter-list-from-damos_new_filter.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: SeongJae Park sj@kernel.org Subject: mm/damon/core: initialize damo_filter->list from damos_new_filter() Date: Sat, 29 Jul 2023 20:37:32 +0000

damos_new_filter() is not initializing the list field of newly allocated filter object. However, DAMON sysfs interface and DAMON_RECLAIM are not initializing it after calling damos_new_filter(). As a result, accessing uninitialized memory is possible. Actually, adding multiple DAMOS filters via DAMON sysfs interface caused NULL pointer dereferencing. Initialize the field just after the allocation from damos_new_filter().

Link: https://lkml.kernel.org/r/20230729203733.38949-2-sj@kernel.org Fixes: 98def236f63c ("mm/damon/core: implement damos filter") Signed-off-by: SeongJae Park sj@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/damon/core.c | 1 + 1 file changed, 1 insertion(+)

--- a/mm/damon/core.c~mm-damon-core-initialize-damo_filter-list-from-damos_new_filter +++ a/mm/damon/core.c @@ -273,6 +273,7 @@ struct damos_filter *damos_new_filter(en return NULL; filter->type = type; filter->matching = matching; + INIT_LIST_HEAD(&filter->list); return filter; }

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Patches currently in -mm which might be from sj@kernel.org are

mm-damon-core-initialize-damo_filter-list-from-damos_new_filter.patch mm-damon-core-test-add-a-test-for-damos_new_filter.patch