linux-kernel - Re: general protection fault in trace_probe

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Message-ID: <20190917211359.0407a222@oasis.local.home>
Date:   Tue, 17 Sep 2019 21:13:59 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Hillf Danton <hdanton@...a.com>
Cc:     syzbot <syzbot+2f807f4d3a2a4e87f18f@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, mhiramat@...nel.org,
        mingo@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in trace_probe_unlink

On Tue, 17 Sep 2019 11:13:42 +0800
Hillf Danton <hdanton@...a.com> wrote:


> --- a/kernel/trace/trace_probe.c
> +++ b/kernel/trace/trace_probe.c
> @@ -986,6 +986,9 @@ int trace_probe_init(struct trace_probe
>  	if (!tp->event)
>  		return -ENOMEM;
>  
> +	/* shun gpf in error cleanup path */
> +	INIT_LIST_HEAD(&tp->list);

Thanks, but I took Masami's patch.

 https://lore.kernel.org/lkml/156869709721.22406.5153754822203046939.stgit@devnote2/

-- Steve

> +
>  	call = trace_probe_event_call(tp);
>  	call->class = &tp->event->class;
>  	call->name = kstrdup(event, GFP_KERNEL);
> @@ -1002,7 +1005,6 @@ int trace_probe_init(struct trace_probe
>  	INIT_LIST_HEAD(&tp->event->files);
>  	INIT_LIST_HEAD(&tp->event->class.fields);
>  	INIT_LIST_HEAD(&tp->event->probes);
> -	INIT_LIST_HEAD(&tp->list);
>  	list_add(&tp->event->probes, &tp->list);
>  
>  	return 0;
> --