mm-damon-reclaim-handle-ctx-allocation-failure.patch removed from -mm tree

The quilt patch titled
Subject: mm/damon/reclaim: handle ctx allocation failure
has been removed from the -mm tree. Its filename was
mm-damon-reclaim-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 <[email protected]>
Subject: mm/damon/reclaim: handle ctx allocation failure
Date: Thu, 28 May 2026 17:01:02 -0700

Patch series "mm/damon/{reclaim,lru_sort}: handle ctx allocation failures".

DAMON_RECLAIM and DAMON_LRU_SORT could dereference NULL pointers if their damon_ctx object allocations fail. The bugs are expected to happen infrequently because the allocations are arguably too small to fail on common setups. But theoretically they are possible and the consequences are bad. Fix those.

The issues were discovered [1] by Sashiko.

This patch (of 2):

DAMON_RECLAIM allocates the damon_ctx object for its kdamond in its init function. damon_reclaim_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.

---

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

@@ -339,6 +339,10 @@ static int damon_reclaim_enabled_store(c
 	if (!damon_initialized())
 		return 0;
 
+	/* damon_modules_new_paddr_ctx_target() in the init function failed. */
+	if (!ctx)
+		return -ENOMEM;
+
 	return damon_reclaim_turn(enabled);
 }
 

_

Patches currently in -mm which might be from [email protected] are

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