[merged mm-stable] mm-mempolicy-fix-memory-leaks-in-weighted_interleave_auto_store.patch removed from -mm tree

[merged mm-stable] mm-mempolicy-fix-memory-leaks-in-weighted_interleave_auto_store.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/mempolicy: fix memory leaks in weighted_interleave_auto_store()
has been removed from the -mm tree.  Its filename was
     mm-mempolicy-fix-memory-leaks-in-weighted_interleave_auto_store.patch

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

------------------------------------------------------
From: Jackie Liu <liuyun01@kylinos.cn>
Subject: mm/mempolicy: fix memory leaks in weighted_interleave_auto_store()
Date: Wed, 1 Apr 2026 08:57:02 +0800

weighted_interleave_auto_store() fetches old_wi_state inside the if
(!input) block only.  This causes two memory leaks:

1. When a user writes "false" and the current mode is already manual,
   the function returns early without freeing the freshly allocated
   new_wi_state.

2. When a user writes "true", old_wi_state stays NULL because the
   fetch is skipped entirely. The old state is then overwritten by
   rcu_assign_pointer() but never freed, since the cleanup path is
   gated on old_wi_state being non-NULL. A user can trigger this
   repeatedly by writing "1" in a loop.

Fix both leaks by moving the old_wi_state fetch before the input check,
making it unconditional.  This also allows a unified early return for both
"true" and "false" when the requested mode matches the current mode.

Link: https://lore.kernel.org/20260401005702.7096-1-liu.yun@linux.dev
Link: https://sashiko.dev/#/patchset/20260331100740.84906-1-liu.yun@linux.dev
Fixes: e341f9c3c841 ("mm/mempolicy: Weighted Interleave Auto-tuning")
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Reviewed by: Donet Tom <donettom@linux.ibm.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: <stable@vger.kernel.org> # v6.16+
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mempolicy.c |   23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

--- a/mm/mempolicy.c~mm-mempolicy-fix-memory-leaks-in-weighted_interleave_auto_store
+++ a/mm/mempolicy.c
@@ -3700,18 +3700,19 @@ static ssize_t weighted_interleave_auto_
 		new_wi_state->iw_table[i] = 1;
 
 	mutex_lock(&wi_state_lock);
-	if (!input) {
-		old_wi_state = rcu_dereference_protected(wi_state,
-					lockdep_is_held(&wi_state_lock));
-		if (!old_wi_state)
-			goto update_wi_state;
-		if (input == old_wi_state->mode_auto) {
-			mutex_unlock(&wi_state_lock);
-			return count;
-		}
+	old_wi_state = rcu_dereference_protected(wi_state,
+				lockdep_is_held(&wi_state_lock));
+
+	if (old_wi_state && input == old_wi_state->mode_auto) {
+		mutex_unlock(&wi_state_lock);
+		kfree(new_wi_state);
+		return count;
+	}
 
-		memcpy(new_wi_state->iw_table, old_wi_state->iw_table,
-					       nr_node_ids * sizeof(u8));
+	if (!input) {
+		if (old_wi_state)
+			memcpy(new_wi_state->iw_table, old_wi_state->iw_table,
+						       nr_node_ids * sizeof(u8));
 		goto update_wi_state;
 	}
 
_

Patches currently in -mm which might be from liuyun01@kylinos.cn are