linux-kernel - Re: [PATCH] fgraph: Make pid

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Message-Id: <20250620093030.3d2d11edf2c4c54c263eddd5@kernel.org>
Date: Fri, 20 Jun 2025 09:30:30 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Artem Sadovnikov <a.sadovnikov@...ras.ru>
Cc: linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
 Masami Hiramatsu <mhiramat@...nel.org>, linux-trace-kernel@...r.kernel.org,
 lvc-project@...uxtesting.org
Subject: Re: [PATCH] fgraph: Make pid_str size match the comment

On Tue, 17 Jun 2025 15:21:09 +0000
Artem Sadovnikov <a.sadovnikov@...ras.ru> wrote:

> The comment above buffer mentions sign, 10 bytes width for number and null
> terminator, but buffer itself isn't large enough to hold that much data.
> 
> This is a cosmetic change, since PID cannot be negative, other than -1.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.

Looks good to me.

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Thanks,

> 
> Signed-off-by: Artem Sadovnikov <a.sadovnikov@...ras.ru>
> ---
>  kernel/trace/trace_functions_graph.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
> index a8c1f56340680..d789d308ab1de 100644
> --- a/kernel/trace/trace_functions_graph.c
> +++ b/kernel/trace/trace_functions_graph.c
> @@ -344,7 +344,7 @@ static void print_graph_proc(struct trace_seq *s, pid_t pid)
>  {
>  	char comm[TASK_COMM_LEN];
>  	/* sign + log10(MAX_INT) + '\0' */
> -	char pid_str[11];
> +	char pid_str[12];
>  	int spaces = 0;
>  	int len;
>  	int i;
> -- 
> 2.43.0
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>