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@xxxxxxxxxxx>
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@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Nhat Pham <nphamcs@xxxxxxxxx>
Acked-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Reviewed-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxx are
