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

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Message-ID: <1580945088.2032.2.camel@kernel.org>
Date:   Wed, 05 Feb 2020 17:24:48 -0600
From:   Tom Zanussi <zanussi@...nel.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] tracing/kprobe: Fix uninitialized variable bug

Hi Gustavo,

On Wed, 2020-02-05 at 16:34 -0600, Gustavo A. R. Silva 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.  Thanks for fixing this!

Reviewed-by: Tom Zanussi <zanussi@...nel.org>



> 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;