linux-kernel - Re: [PATCH 1/2] tty: serial: samsung_tty: Fix a memory leak in s3c24xx_serial

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Message-ID: <20230610102607.7nonyh5xhuhpyy6e@intel.intel>
Date:   Sat, 10 Jun 2023 12:26:07 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Thomas Abraham <thomas.abraham@...aro.org>,
        Kukjin Kim <kgene.kim@...sung.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 1/2] tty: serial: samsung_tty: Fix a memory leak in
 s3c24xx_serial_getclk() in case of error

Hi Christophe,

On Fri, Jun 09, 2023 at 06:45:38AM +0200, Christophe JAILLET wrote:
> If clk_get_rate() fails, the clk that has just been allocated needs to be
> freed.
> 
> Fixes: 5f5a7a5578c5 ("serial: samsung: switch to clkdev based clock lookup")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

As this is a fix, can you cc the stable kernel

Cc: <stable@...r.kernel.org> # v3.3+

> ---
>  drivers/tty/serial/samsung_tty.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 2a7520ad3abd..dd751e7010e3 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -1459,8 +1459,10 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
>  			continue;
>  
>  		rate = clk_get_rate(clk);
> -		if (!rate)
> +		if (!rate) {
> +			clk_put(clk);
>  			continue;

could you also print an error here?

In any case:

Reviewed-by: Andi Shyti <andi.shyti@...nel.org> 

Andi

> +		}
>  
>  		if (ourport->info->has_divslot) {
>  			unsigned long div = rate / req_baud;
> -- 
> 2.34.1
>