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mm/damon/lru_sort: handle ctx allocation failure

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DAMON_LRU_SORT allocates the damon_ctx object for its kdamond in its init
function.  damon_lru_sort_enabled_store() wrongly assumes the allocation
will always succeed once tried.  If the damon_ctx allocation was failed,
therefore, code execution reaches to damon_commit_ctx() while 'ctx' is
NULL.  As a result, it dereferences the NULL 'ctx' pointer.  Avoid the
NULL dereference by returning -ENOMEM if 'ctx' is NULL.

Link: https://lore.kernel.org/20260529000104.7006-3-sj@kernel.org
Fixes: c4a8e662c8 ("mm/damon/lru_sort: use damon_initialized()")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> # 6.18.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-05-28 17:01:03 -07:00 • committed by Andrew Morton
commit ab04340b5a
1 changed files with 4 additions and 0 deletions
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4
mm/damon/lru_sort.c
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@ -437,6 +437,10 @@ static int damon_lru_sort_enabled_store(const char *val,
if (!damon_initialized())
return 0;
/* damon_modules_new_paddr_ctx_target() in the init function failed. */
if (!ctx)
return -ENOMEM;
return damon_lru_sort_turn(enabled);
}