+ kasan-fix-object-remaining-in-offline-per-cpu-quarantine-fix.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: kasan: fix slab double free when cpu-hotplug
has been added to the -mm tree.  Its filename is
     kasan-fix-object-remaining-in-offline-per-cpu-quarantine-fix.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/kasan-fix-object-remaining-in-offline-per-cpu-quarantine-fix.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/kasan-fix-object-remaining-in-offline-per-cpu-quarantine-fix.patch

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------------------------------------------------------
From: Zqiang <qiang.zhang@windriver.com>
Subject: kasan: fix slab double free when cpu-hotplug

When a CPU offline, the per-cpu quarantine's offline be set true, after
this, if the quarantine_put be called in this CPU, the objects will be
free and return false, free objects doesn't to be done, due to return
false, the slab memory manager will free this objects.

Link: https://lkml.kernel.org/r/20201204102206.20237-1-qiang.zhang@windriver.com
Fixes: 41ab1aae781f ("kasan: fix object remaining in offline per-cpu quarantine")
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Guangye Yang <guangye.yang@mediatek.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Nicholas Tang <nicholas.tang@mediatek.com>
Cc: Miles Chen <miles.chen@mediatek.com>
Cc: Qian Cai <qcai@redhat.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/kasan/quarantine.c |    1 -
 1 file changed, 1 deletion(-)

--- a/mm/kasan/quarantine.c~kasan-fix-object-remaining-in-offline-per-cpu-quarantine-fix
+++ a/mm/kasan/quarantine.c
@@ -191,7 +191,6 @@ void quarantine_put(struct kasan_free_me
 
 	q = this_cpu_ptr(&cpu_quarantine);
 	if (q->offline) {
-		qlink_free(&info->quarantine_link, cache);
 		local_irq_restore(flags);
 		return;
 	}
_

Patches currently in -mm which might be from qiang.zhang@windriver.com are

kasan-fix-object-remaining-in-offline-per-cpu-quarantine-fix.patch