linux-kernel - Re: [PATCH] tracing: Fix missing trace_boot_init

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Message-Id: <20211026172743.be436b228057c26fd73d0649@kernel.org>
Date:   Tue, 26 Oct 2021 17:27:43 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH] tracing: Fix missing trace_boot_init_histograms kstrdup
 NULL checks

On Mon, 25 Oct 2021 23:10:17 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Fri, 15 Oct 2021 15:55:50 -0400
> Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:
> 
> > trace_boot_init_histograms misses NULL pointer checks for kstrdup
> > failure.
> > 
> > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> 
> Masami,
> 
> Can you ack this?

Yes, thanks for reporting this!

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

Thank you!

> 
> -- Steve
> 
> > ---
> >  kernel/trace/trace_boot.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
> > index 8d252f63cd78..0580287d7a0d 100644
> > --- a/kernel/trace/trace_boot.c
> > +++ b/kernel/trace/trace_boot.c
> > @@ -430,6 +430,8 @@ trace_boot_init_histograms(struct trace_event_file *file,
> >  		/* All digit started node should be instances. */
> >  		if (trace_boot_compose_hist_cmd(node, buf, size) == 0) {
> >  			tmp = kstrdup(buf, GFP_KERNEL);
> > +			if (!tmp)
> > +				return;
> >  			if (trigger_process_regex(file, buf) < 0)
> >  				pr_err("Failed to apply hist trigger: %s\n", tmp);
> >  			kfree(tmp);
> > @@ -439,6 +441,8 @@ trace_boot_init_histograms(struct trace_event_file *file,
> >  	if (xbc_node_find_subkey(hnode, "keys")) {
> >  		if (trace_boot_compose_hist_cmd(hnode, buf, size) == 0) {
> >  			tmp = kstrdup(buf, GFP_KERNEL);
> > +			if (!tmp)
> > +				return;
> >  			if (trigger_process_regex(file, buf) < 0)
> >  				pr_err("Failed to apply hist trigger: %s\n", tmp);
> >  			kfree(tmp);
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>