linux-kernel - Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in task_work

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Message-ID: <20250301000552.2827-1-hdanton@sina.com>
Date: Sat,  1 Mar 2025 08:05:51 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+aef8e425f1a85ee5ef1c@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in task_work_run

On Thu, 27 Feb 2025 08:59:23 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    63817c771194 selftests/bpf: Test struct_ops program with _..
> git tree:       bpf-next
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12d306e4580000

#syz test

--- x/kernel/events/core.c
+++ y/kernel/events/core.c
@@ -5368,6 +5368,7 @@ static void _free_event(struct perf_even
 
 	exclusive_event_destroy(event);
 	module_put(event->pmu->module);
+	perf_pending_task_sync(event);
 
 	call_rcu(&event->rcu_head, free_event_rcu);
 }
--