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From: Steven Rostedt <rostedt@goodmis.org>
To: Edward Adam Davis <eadavis@qq.com>
Cc: syzbot+daba72c4af9915e9c894@syzkaller.appspotmail.com,
	linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
	mathieu.desnoyers@efficios.com, mhiramat@kernel.org,
	syzkaller-bugs@googlegroups.com
Subject: Re: [PATCH] tracing: Fix filter logic error
Date: Tue, 24 Jun 2025 15:17:56 -0400	[thread overview]
Message-ID: <20250624151756.47f03db9@batman.local.home> (raw)
In-Reply-To: <tencent_4EF87A626D702F816CD0951CE956EC32CD0A@qq.com>

On Tue, 24 Jun 2025 14:38:46 +0800
Edward Adam Davis <eadavis@qq.com> wrote:

> If the processing of the tr->events loop fails, the filter that has been
> added to filter_head will be released twice in free_filter_list(&head->rcu)
> and __free_filter(filter).
> 
> After adding the filter of tr->events, add the filter to the filter_head
> process to avoid triggering uaf.

Ah that was the kmalloc that failed.

Thanks,

-- Steve

  parent reply	other threads:[~2025-06-24 19:18 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-06-23 23:58 [syzbot] [trace?] KASAN: slab-use-after-free Read in __free_filter syzbot
2025-06-24  6:10 ` Edward Adam Davis
2025-06-24  6:32   ` syzbot
2025-06-24  6:38 ` [PATCH] tracing: Fix filter logic error Edward Adam Davis
2025-06-24  7:44   ` Masami Hiramatsu
2025-06-24 19:17   ` Steven Rostedt [this message]
2025-06-24  8:25 ` [syzbot] [trace?] KASAN: slab-use-after-free Read in __free_filter Hillf Danton
2025-06-24  8:47   ` syzbot
2025-06-24 18:44 ` Steven Rostedt

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