From: Oleg Nesterov <oleg@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] tracing: Simplify trace_array_get()
Date: Fri, 19 Jul 2013 18:33:12 +0200 [thread overview]
Message-ID: <20130719163312.GA21544@redhat.com> (raw)
In-Reply-To: <1374251217.3356.12.camel@gandalf.local.home>
On 07/19, Steven Rostedt wrote:
>
> On Fri, 2013-07-19 at 17:51 +0200, Oleg Nesterov wrote:
> > mutex_lock(&trace_types_lock);
> > - list_for_each_entry(tr, &ftrace_trace_arrays, list) {
> > - if (tr == this_tr) {
> > - tr->ref++;
> > - ret = 0;
> > - break;
> > - }
> > + if (!list_empty(&this_tr->list)) {
>
> Because this_tr can be freed outside the lock. Accessing this_tr->list
> can cause a crash.
Aaah, indeed.
Thanks Steven!
Oleg.
next prev parent reply other threads:[~2013-07-19 16:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-19 15:50 [PATCH 0/1] tracing: Simplify trace_array_get() Oleg Nesterov
2013-07-19 15:51 ` [PATCH 1/1] " Oleg Nesterov
2013-07-19 16:26 ` Steven Rostedt
2013-07-19 16:33 ` Oleg Nesterov [this message]
2013-07-19 17:20 ` Oleg Nesterov
2013-07-19 17:35 ` Steven Rostedt
2013-07-19 17:39 ` Steven Rostedt
2013-07-19 18:24 ` Oleg Nesterov
2013-07-21 19:14 ` Oleg Nesterov
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