linux-kernel - Re: [PATCH] tracing/dynevent: Fix a memory leak in an error handling path

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Date:   Mon, 12 Apr 2021 17:56:11 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     rostedt@...dmis.org, mingo@...hat.com, zanussi@...nel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] tracing/dynevent: Fix a memory leak in an error
 handling path

On Sun, 11 Apr 2021 12:21:54 +0200
Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:

> We must free 'argv' before returning, as already done in all the other
> paths of this function.

OOps, thanks for finding the bug!

> 
> Fixes: d262271d0483 ("tracing/dynevent: Delegate parsing to create function")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

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

Thank you,

> ---
>  kernel/trace/trace_dynevent.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> index dc971a68dda4..e57cc0870892 100644
> --- a/kernel/trace/trace_dynevent.c
> +++ b/kernel/trace/trace_dynevent.c
> @@ -63,8 +63,10 @@ int dyn_event_release(const char *raw_command, struct dyn_event_operations *type
>  		event = p + 1;
>  		*p = '\0';
>  	}
> -	if (event[0] == '\0')
> -		return -EINVAL;
> +	if (event[0] == '\0') {
> +		ret = -EINVAL;
> +		goto out;
> +	}
>  
>  	mutex_lock(&event_mutex);
>  	for_each_dyn_event_safe(pos, n) {
> -- 
> 2.27.0
> 


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