linux-kernel - Re: [PATCH] thermal/lib: Fix memory leak on error in thermal_genl

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Message-ID: <b2b24684-1760-43e4-8091-64e59334a0fa@arm.com>
Date: Thu, 24 Oct 2024 12:07:09 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Zhang Rui <rui.zhang@...el.com>,
 "open list:THERMAL" <linux-pm@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>, rafael@...nel.org
Subject: Re: [PATCH] thermal/lib: Fix memory leak on error in
 thermal_genl_auto()

Hi Daniel,

On 10/24/24 11:59, Daniel Lezcano wrote:
> The function thermal_genl_auto() does not free the allocated message
> in the error path. Fix that by putting a out label and jump to it
> which will free the message instead of directly returning an error.
> 
> Reported-by: Lukasz Luba <lukasz.luba@....com>.
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>   tools/lib/thermal/commands.c | 13 ++++++++-----
>   1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/lib/thermal/commands.c b/tools/lib/thermal/commands.c
> index bcf0f14d035a..b0d4c8aca21c 100644
> --- a/tools/lib/thermal/commands.c
> +++ b/tools/lib/thermal/commands.c
> @@ -375,27 +375,30 @@ static thermal_error_t thermal_genl_auto(struct thermal_handler *th, cmd_cb_t cm
>   					 struct cmd_param *param,
>   					 int cmd, int flags, void *arg)
>   {
> +	thermal_error_t ret = THERMAL_ERROR;
>   	struct nl_msg *msg;
>   	void *hdr;
>   
>   	msg = nlmsg_alloc();
>   	if (!msg)
> -		return THERMAL_ERROR;
> +		goto out;
>   
>   	hdr = genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, thermal_cmd_ops.o_id,
>   			  0, flags, cmd, THERMAL_GENL_VERSION);
>   	if (!hdr)
> -		return THERMAL_ERROR;
> +		goto out;
>   
>   	if (cmd_cb && cmd_cb(msg, param))
> -		return THERMAL_ERROR;
> +		goto out;
>   
>   	if (nl_send_msg(th->sk_cmd, th->cb_cmd, msg, genl_handle_msg, arg))
> -		return THERMAL_ERROR;
> +		goto out;
>   
> +	ret = THERMAL_SUCCESS;
> +out:
>   	nlmsg_free(msg);
>   
> -	return THERMAL_SUCCESS;
> +	return ret;
>   }
>   
>   thermal_error_t thermal_cmd_get_tz(struct thermal_handler *th, struct thermal_zone **tz)

LGTM,

Reviewed-by: Lukasz Luba <lukasz.luba@....com>

Regards,
Lukasz