[v1] mm/damon/{reclaim,lru_sort}: handle ctx allocation failures

[PATCH 0/2] mm/damon/{reclaim,lru_sort}: handle ctx allocation failures

SeongJae Park posted 2 patches 1 week, 3 days ago

Diff against v1
Download series mbox

mm/damon/lru_sort.c | 4 ++++
mm/damon/reclaim.c  | 4 ++++
2 files changed, 8 insertions(+)

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[PATCH 0/2] mm/damon/{reclaim,lru_sort}: handle ctx allocation failures

Posted by SeongJae Park 1 week, 3 days ago

DAMON_RECLAIM and DAMON_LRU_SORT could dereference NULL pointers if
their damon_ctx object allocations fail.  The bug is expected to happen
not frequently,, because the allocation is arguably too small to fail on
common setup.  But theoretically it is possible and the consequence is
bad.  Fix those.

The issue was discovered [1] by Sashiko.

[1] https://lore.kernel.org/20260419014800.877-1-sj@kernel.org

Changes from RFC v1
- RFC v1: https://lore.kernel.org/20260528061110.2172-1-sj@kernel.org
- Drop RFC tag.

SeongJae Park (2):
  mm/damon/reclaim: handle ctx allocation failure
  mm/damonn/lru_sort: handle ctx allocation failure

 mm/damon/lru_sort.c | 4 ++++
 mm/damon/reclaim.c  | 4 ++++
 2 files changed, 8 insertions(+)


base-commit: 62a58b8764d8e485eee4c12d24ee107ef11c98f5
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2.47.3