[merged mm-stable] mm-zswap-warn-when-referencing-a-dead-entry.patch removed from -mm tree

[merged mm-stable] mm-zswap-warn-when-referencing-a-dead-entry.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: zswap: warn when referencing a dead entry
has been removed from the -mm tree.  Its filename was
     mm-zswap-warn-when-referencing-a-dead-entry.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: Johannes Weiner <hannes@cmpxchg.org>
Subject: mm: zswap: warn when referencing a dead entry
Date: Mon, 29 Jan 2024 20:36:40 -0500

Put a standard sanity check on zswap_entry_get() for UAF scenario.

Link: https://lkml.kernel.org/r/20240130014208.565554-5-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Nhat Pham <nphamcs@gmail.com>
Acked-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/zswap.c |    1 +
 1 file changed, 1 insertion(+)

--- a/mm/zswap.c~mm-zswap-warn-when-referencing-a-dead-entry
+++ a/mm/zswap.c
@@ -541,6 +541,7 @@ static void zswap_entry_free(struct zswa
 /* caller must hold the tree lock */
 static void zswap_entry_get(struct zswap_entry *entry)
 {
+	WARN_ON_ONCE(!entry->refcount);
 	entry->refcount++;
 }
 
_

Patches currently in -mm which might be from hannes@cmpxchg.org are