linux-kernel - Re: [PATCH][next] tracing/kprobe: Fix uninitialized variable bug

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Date:   Thu, 6 Feb 2020 08:45:33 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] tracing/kprobe: Fix uninitialized variable bug

On Wed, 5 Feb 2020 16:34:04 -0600
"Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote:

> There is a potential execution path in which variable *ret* is returned
> without being properly initialized, previously.
> 
> Fix this by initializing variable *ret* to 0.

Good catch!

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

Thank you!

> 
> Addresses-Coverity-ID: 1491142 ("Uninitialized scalar variable")
> Fixes: 2a588dd1d5d6 ("tracing: Add kprobe event command generation functions")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  kernel/trace/trace_kprobe.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index d8264ebb9581..362cca52f5de 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -1012,7 +1012,7 @@ int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...)
>  {
>  	struct dynevent_arg arg;
>  	va_list args;
> -	int ret;
> +	int ret = 0;
>  
>  	if (cmd->type != DYNEVENT_TYPE_KPROBE)
>  		return -EINVAL;
> -- 
> 2.25.0
> 


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