linux-kernel - Re: [PATCH] tracing: Fix filter logic error

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Message-ID: <20250624151756.47f03db9@batman.local.home>
Date: Tue, 24 Jun 2025 15:17:56 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Edward Adam Davis <eadavis@...com>
Cc: syzbot+daba72c4af9915e9c894@...kaller.appspotmail.com,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 mathieu.desnoyers@...icios.com, mhiramat@...nel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] tracing: Fix filter logic error

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