[merged mm-hotfixes-stable] mm-damonn-lru_sort-handle-ctx-allocation-failure.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-damonn-lru_sort-handle-ctx-allocation-failure.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/lru_sort: handle ctx allocation failure
has been removed from the -mm tree.  Its filename was
     mm-damonn-lru_sort-handle-ctx-allocation-failure.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/lru_sort: handle ctx allocation failure
Date: Thu, 28 May 2026 17:01:03 -0700

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: c4a8e662c839 ("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>
---

 mm/damon/lru_sort.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/mm/damon/lru_sort.c~mm-damonn-lru_sort-handle-ctx-allocation-failure
+++ a/mm/damon/lru_sort.c
@@ -437,6 +437,10 @@ static int damon_lru_sort_enabled_store(
 	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);
 }
 
_

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

maintainers-add-testing-abi-documents-for-mm.patch