linux-kernel - Re: [PATCH] tracing: Keep index within map_pid_to

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Message-ID: <alpine.DEB.2.00.0906161212550.26673@gandalf.stny.rr.com>
Date:	Tue, 16 Jun 2009 12:13:36 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Roel Kluin <roel.kluin@...il.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] tracing: Keep index within map_pid_to_cmdline[]



On Tue, 16 Jun 2009, Roel Kluin wrote:

> Ensure that index `pid' remains within array map_pid_to_cmdline[]
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 8acd9b8..f359e9e 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -803,7 +803,7 @@ void trace_find_cmdline(int pid, char comm[])
>  		return;
>  	}
>  
> -	if (pid > PID_MAX_DEFAULT) {
> +	if (pid > PID_MAX_DEFAULT || pid < 0) {
>  		strcpy(comm, "<...>");
>  		return;
>  	}

Did you ever hit a case where pid was < 0? Or is this just a "safety 
patch"?

-- Steve

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